Registration Examination for Dietitians (RDN/RD) — Questions and Answers

Question 1: A study reports a p-value of 0.03. This BEST indicates that:

The null hypothesis is accepted
The results are clinically significant and meaningful
The effect size observed in the study is large
There is a 3% probability the observed results occurred by chance alone if the null hypothesis is true (Correct answer)

Correct answer: There is a 3% probability the observed results occurred by chance alone if the null hypothesis is true

A p-value of 0.03 means there is a 3% probability of obtaining the observed results (or more extreme) if the null hypothesis were true, indicating statistical significance at the 0.05 level.

Question 2: Which of the following is a key advantage of the diet history method compared to a 24-hour recall?

Requires less interviewer training
Is less subject to recall bias
Captures usual dietary patterns over a longer time period (Correct answer)
Takes less time to administer

Correct answer: Captures usual dietary patterns over a longer time period

The diet history interview captures habitual dietary patterns over weeks or months, providing a broader picture of usual intake than a single-day recall.

Question 3: A confounding variable in a nutritional epidemiology study is BEST described as:

A variable associated with both the exposure and outcome that can distort the true relationship between them (Correct answer)
A variable that has no relationship with the exposure or outcome
The primary outcome variable being measured
The primary independent variable being studied

Correct answer: A variable associated with both the exposure and outcome that can distort the true relationship between them

A confounder is associated with both the exposure and the outcome; if not controlled for, it can create a spurious or masked association between the exposure and the outcome of interest.

Question 4: What is the primary purpose of professional certification in Nutritional Biochemistry?

To validate competency and knowledge in the field (Correct answer)
To meet legal requirements only
To replace practical experience
To increase salary automatically

Correct answer: To validate competency and knowledge in the field

Certification validates that a professional has met established standards of knowledge and competency in Nutritional Biochemistry.

Question 5: Which of these is a requirement for dietetics licensure in most U.S. states?

Working in a hospital for one year
Completing a Ph.D. in Nutrition
Internship or supervised practice (Correct answer)
Volunteer work in community nutrition

Correct answer: Internship or supervised practice

In addition to a bachelor's degree and passing the CDR exam, completing an accredited supervised practice program (often called an internship) is a mandatory requirement for RDN credentialing and state licensure in most U.S. states. This practical experience provides hands-on training in various dietetics settings, allowing candidates to apply their academic knowledge under the guidance of experienced RDNs.

Question 6: Which foodborne illness is caused by a preformed toxin and typically causes symptoms within 1–6 hours of ingestion, with no fever?

Campylobacteriosis
Staphylococcal food poisoning (Correct answer)
Shigellosis
Salmonellosis

Correct answer: Staphylococcal food poisoning

Staphylococcus aureus produces a heat-stable enterotoxin in food; since illness results from the preformed toxin, onset is rapid (1–6 hours) and typically lacks fever.

Question 7: What is the first priority in any emergency situation?

Ensure the safety of all personnel (Correct answer)
Contact the media
Save equipment
Write a report

Correct answer: Ensure the safety of all personnel

In any emergency, the first priority is always the safety and well-being of all personnel. Equipment and materials can be replaced; lives cannot.

Question 8: What is the relationship between theory and practice in Food Service Management?

Theory provides the foundation; practice applies it to real situations (Correct answer)
Theory is unnecessary
They are completely separate
Practice is unnecessary if you know theory

Correct answer: Theory provides the foundation; practice applies it to real situations

Theory provides the conceptual foundation and principles, while practice involves applying those concepts to real-world situations. Both are essential for competence.

Question 9: What certification might an RDN pursue to specialize in working with individuals with diabetes?

Certified Diabetes Care and Education Specialist (CDCES) (Correct answer)
Renal Nutrition Specialist Certification
Geriatric Nutrition Certification
Certified Sports Dietitian (CSSD)

Correct answer: Certified Diabetes Care and Education Specialist (CDCES)

The Certified Diabetes Care and Education Specialist (CDCES) credential is a highly recognized specialization for healthcare professionals, including RDNs, who educate and support individuals with diabetes. This certification demonstrates advanced knowledge and expertise in diabetes management, self-care education, and prevention strategies. It allows RDNs to provide specialized and comprehensive care to this patient population.

Question 10: A patient post-Roux-en-Y gastric bypass is at highest risk for deficiency of which nutrient due to bypass of the primary absorption site?

Vitamin D
Vitamin C
Selenium
Iron (Correct answer)

Correct answer: Iron

Iron is primarily absorbed in the duodenum and proximal jejunum, which are bypassed in RYGB, placing patients at high risk for iron deficiency anemia.

Question 11: An RDN is designing a quality improvement (QI) project to reduce malnutrition rates in a long-term care facility. Which step should come FIRST?

Implement a new feeding assistance program immediately
Purchase new nutritional supplements for all residents
Measure current malnutrition rates to establish a baseline (Correct answer)
Hire additional dietary staff

Correct answer: Measure current malnutrition rates to establish a baseline

Quality improvement projects begin with measuring baseline performance to identify the gap and set a target for improvement.

Question 12: A premature infant born at 28 weeks gestation requires parenteral nutrition. The appropriate initial protein provision should be:

1.5–2.0 g/kg/day
2.0–2.5 g/kg/day
0.5 g/kg/day
3.5–4.0 g/kg/day (Correct answer)

Correct answer: 3.5–4.0 g/kg/day

Extremely premature infants require aggressive early protein provision of 3.5–4.0 g/kg/day via PN to replicate intrauterine accretion rates and support brain development.

Question 13: A registered dietitian is developing a MNT protocol for bariatric surgery patients 6 months post-sleeve gastrectomy. Which supplement regimen is most critical to include?

Omega-3 fatty acids and fiber supplements
Vitamin E and selenium only
Magnesium and potassium only
Multivitamin with iron, calcium citrate, vitamin D, and vitamin B12 (Correct answer)

Correct answer: Multivitamin with iron, calcium citrate, vitamin D, and vitamin B12

Post-sleeve gastrectomy patients require lifelong supplementation with a multivitamin, iron, calcium citrate (preferred over carbonate), vitamin D, and B12 to prevent common deficiencies caused by reduced intake and gastric acid.

Question 14: Which type of assessment error occurs when a respondent systematically under-reports intake due to social desirability?

Attenuation bias
Regression dilution
Systematic bias (Correct answer)
Random measurement error

Correct answer: Systematic bias

Systematic bias occurs when reporting errors are consistent in one direction, such as under-reporting high-calorie or stigmatized foods.

Question 15: In a randomized controlled trial (RCT), what is the PRIMARY purpose of randomization?

To reduce study costs and duration
To increase the overall sample size
To eliminate selection bias and ensure group comparability (Correct answer)
To blind participants to their treatment assignment

Correct answer: To eliminate selection bias and ensure group comparability

Randomization distributes known and unknown confounders equally between groups, reducing selection bias and ensuring the groups are comparable at baseline.

Question 16: A 68-year-old woman with osteoporosis and vitamin D deficiency is recommended a daily calcium intake of 1,200 mg. She consumes 600 mg from food. How much supplemental calcium is needed, and what form is preferred if she takes omeprazole?

600 mg as calcium carbonate
600 mg as calcium citrate (Correct answer)
1,200 mg as calcium carbonate
No supplement needed if dairy is included

Correct answer: 600 mg as calcium citrate

Calcium citrate does not require stomach acid for absorption, making it preferable for patients on acid-suppressing medications like proton pump inhibitors.

Question 17: Which of the following is a typical work setting for an RDN?

Auto repair shops
Construction sites
Software development firms
Hospitals and clinics (Correct answer)

Correct answer: Hospitals and clinics

Hospitals and clinics are among the most common work settings for Registered Dietitian Nutritionists. In these environments, RDNs provide medical nutrition therapy to patients with various health conditions, conduct nutritional assessments, and collaborate with healthcare teams. They play a vital role in patient recovery, disease management, and health promotion within clinical care.

Question 18: What role does ethics play in Food Service Management practice?

It only applies to managers
It only matters for legal compliance
Ethics is optional in professional settings
It guides professional conduct and protects stakeholders (Correct answer)

Correct answer: It guides professional conduct and protects stakeholders

Professional ethics provide frameworks for responsible decision-making, ensuring practitioners act in the best interest of those they serve.

Question 19: A researcher wants to assess omega-3 fatty acid intake in a cohort study of 10,000 adults. Which method is MOST feasible and valid for this purpose?

Validated food frequency questionnaire with a fat module (Correct answer)
7-day weighed food records
Two 24-hour recalls per participant
Plasma phospholipid fatty acid biomarkers only

Correct answer: Validated food frequency questionnaire with a fat module

A validated FFQ with a detailed fat module is both feasible for large cohorts and has demonstrated validity against biomarkers for omega-3 fatty acid assessment.

Question 20: Which study approach is most effective for Community Nutrition material?

Active recall with practice questions (Correct answer)
Studying for very long sessions without breaks
Highlighting all text
Passive re-reading of notes

Correct answer: Active recall with practice questions

Active recall through practice questions is the most effective study method, as it strengthens memory retrieval pathways.

Question 21: How should you manage time during a timed test?

Rush through the entire test
Spend equal time on every question
Only work on hard questions
Divide total time by questions and pace yourself, spending less on easy ones (Correct answer)

Correct answer: Divide total time by questions and pace yourself, spending less on easy ones

Calculate time per question, spend less on easy questions to bank time for harder ones, and check your pace periodically.

Question 22: In which setting is an RDN likely to work as a food service manager?

Retail stores
School cafeterias or corporate dining facilities (Correct answer)
Fitness centers
Research laboratories

Correct answer: School cafeterias or corporate dining facilities

RDNs often work as food service managers in institutional settings where large-scale meal planning and preparation are required. School cafeterias and corporate dining facilities are prime examples, where RDNs ensure that meals meet nutritional standards, accommodate dietary restrictions, and adhere to budgetary constraints. They oversee staff, manage operations, and maintain food safety.

Question 23: Which study approach is most effective for Food Service Management material?

Passive re-reading of notes
Highlighting all text
Active recall with practice questions (Correct answer)
Studying for very long sessions without breaks

Correct answer: Active recall with practice questions

Active recall through practice questions is the most effective study method, as it strengthens memory retrieval pathways.

Question 24: Which study approach is most effective for Nutritional Biochemistry material?

Passive re-reading of notes
Active recall with practice questions (Correct answer)
Highlighting all text
Studying for very long sessions without breaks

Correct answer: Active recall with practice questions

Active recall through practice questions is the most effective study method, as it strengthens memory retrieval pathways.

Question 25: What does PPE stand for?

Professional Performance Evaluation
Post-Production Equipment
Personal Protective Equipment (Correct answer)
Pre-Planning Exercise

Correct answer: Personal Protective Equipment

PPE refers to equipment worn to minimize exposure to hazards, including helmets, gloves, eye protection, and safety boots.

Question 26: Which method is MOST appropriate for assessing dietary intake in a population-level nutrition survey?

Annual food frequency questionnaires only
Single 24-hour dietary recall with statistical adjustment (Correct answer)
Clinical diet history interviews
Repeated weighed food records

Correct answer: Single 24-hour dietary recall with statistical adjustment

A single 24-hour recall combined with statistical methods (e.g., the NCI method) can estimate usual intake distributions at the population level efficiently.

Question 27: What examination must candidates pass to earn the RDN credential?

National Nutrition Assessment Exam
Commission on Dietetic Registration Exam (Correct answer)
Dietetics Licensing Board Exam
Certified Clinical Nutritionist Exam

Correct answer: Commission on Dietetic Registration Exam

After completing an ACEND-accredited didactic program and supervised practice, candidates must pass the national examination administered by the Commission on Dietetic Registration (CDR). This comprehensive exam assesses the candidate's knowledge and skills across various domains of dietetics practice. Successfully passing this exam is the final step to earning the RDN credential.

Question 28: An RDN is presenting research findings to a lay audience at a community health fair. Which communication strategy is MOST effective?

Provide full research citations for all claims made
Simplify language, use visuals, and relate information to everyday food choices (Correct answer)
Limit the presentation to statistical data for credibility
Use precise clinical terminology to demonstrate expertise

Correct answer: Simplify language, use visuals, and relate information to everyday food choices

Health communication with lay audiences is most effective when it uses plain language, visual aids, and practical, relatable examples.

Question 29: Attenuation bias in nutrition research refers to which phenomenon?

Confounding introduced by supplement use
Bias from excluding non-responders
Underestimation of diet-disease associations due to measurement error (Correct answer)
Overestimation of dietary effects due to large sample sizes

Correct answer: Underestimation of diet-disease associations due to measurement error

Measurement error in dietary assessment attenuates (weakens) observed associations between diet and disease outcomes toward the null.

Question 30: Which of the following is a primary limitation of using only one 24-hour dietary recall to assess an individual's usual intake?

Respondents cannot remember yesterday's food
Day-to-day variability makes a single day unrepresentative of habitual intake (Correct answer)
It does not capture macronutrient data
It is too expensive to administer

Correct answer: Day-to-day variability makes a single day unrepresentative of habitual intake

A single 24-hour recall reflects only one day's intake and may not represent a person's typical diet due to intra-individual variability.

Question 31: The FIFO (First In, First Out) inventory method is used in food storage primarily to:

Maximize storage space efficiency
Reduce the need for date labeling
Ensure older products are used before newer ones to reduce spoilage (Correct answer)
Prioritize expensive ingredients for use first

Correct answer: Ensure older products are used before newer ones to reduce spoilage

FIFO ensures older inventory is used first, minimizing the risk of expired or spoiled food being served.

Question 32: What is the purpose of an emergency action plan?

To schedule daily activities
To assign parking spaces
To establish procedures for responding to various emergencies (Correct answer)
To manage budgets

Correct answer: To establish procedures for responding to various emergencies

Emergency action plans outline specific procedures for different emergency scenarios, ensuring organized, efficient response that protects personnel.

Question 33: What is the relationship between theory and practice in Lifecycle Nutrition?

Theory is unnecessary
They are completely separate
Theory provides the foundation; practice applies it to real situations (Correct answer)
Practice is unnecessary if you know theory

Correct answer: Theory provides the foundation; practice applies it to real situations

Theory provides the conceptual foundation and principles, while practice involves applying those concepts to real-world situations. Both are essential for competence.

Question 34: Botulism toxin from Clostridium botulinum is most likely to develop in which food storage scenario?

Refrigerated pasteurized milk stored at 38°F
Commercially canned tomatoes with pH 4.0
Frozen vegetables kept at 0°F
Improperly home-canned low-acid vegetables stored at room temperature (Correct answer)

Correct answer: Improperly home-canned low-acid vegetables stored at room temperature

C. botulinum thrives in anaerobic, low-acid environments at room temperature; improperly canned low-acid foods provide ideal conditions for toxin production.

Question 35: Which dietary modification is the primary MNT recommendation for a patient newly diagnosed with nephrotic syndrome?

Sodium restriction to manage edema (Correct answer)
High-fat diet to provide energy
Fluid restriction below 1 L/day
High-protein diet to compensate for urinary losses

Correct answer: Sodium restriction to manage edema

Sodium restriction is the primary MNT goal in nephrotic syndrome to manage edema and hypertension, while excessive protein supplementation is no longer recommended.

Question 36: Cross-contamination in a food preparation setting is BEST prevented by:

Washing all produce with soap before use
Using separate cutting boards for raw meats and ready-to-eat foods (Correct answer)
Using the same knife for all foods after visual inspection
Storing cooked foods on shelves below raw meats

Correct answer: Using separate cutting boards for raw meats and ready-to-eat foods

Dedicated cutting boards for raw meats and ready-to-eat foods is the primary physical barrier against cross-contamination.

Question 37: What role does ethics play in Nutritional Biochemistry practice?

It only matters for legal compliance
Ethics is optional in professional settings
It only applies to managers
It guides professional conduct and protects stakeholders (Correct answer)

Correct answer: It guides professional conduct and protects stakeholders

Professional ethics provide frameworks for responsible decision-making, ensuring practitioners act in the best interest of those they serve.

Question 38: What is the relationship between theory and practice in Community Nutrition?

Theory is unnecessary
They are completely separate
Practice is unnecessary if you know theory
Theory provides the foundation; practice applies it to real situations (Correct answer)

Correct answer: Theory provides the foundation; practice applies it to real situations

Theory provides the conceptual foundation and principles, while practice involves applying those concepts to real-world situations. Both are essential for competence.

Question 39: Which communication skill is most essential for RDNs when working with clients?

Public speaking
Data analysis
Research paper writing
Motivational interviewing (Correct answer)

Correct answer: Motivational interviewing

Motivational interviewing is a client-centered counseling approach that is highly effective for RDNs working with clients to facilitate behavior change. It helps clients explore and resolve ambivalence about changing their eating habits, fostering intrinsic motivation. This skill is crucial for empowering clients to make sustainable dietary and lifestyle modifications.

Question 40: What should you do when encountering a difficult question?

Mark it, move on, and return to it later (Correct answer)
Stare at it until you figure it out
Skip it permanently
Guess immediately without reading

Correct answer: Mark it, move on, and return to it later

Mark difficult questions and move on to avoid wasting time. After completing easier questions, return with fresh perspective and remaining time.

Question 41: Which study design is BEST suited to establish a causal relationship between a dietary pattern and disease?

Ecological study
Randomized controlled trial (Correct answer)
Case-control study
Cross-sectional study

Correct answer: Randomized controlled trial

RCTs are the gold standard for establishing causality because randomization controls for confounding variables, allowing true cause-and-effect relationships to be determined.

Question 42: Which nutrient is MOST difficult to assess accurately using a standard food frequency questionnaire?

Dietary fiber
Carbohydrates
Vitamin D (Correct answer)
Total fat

Correct answer: Vitamin D

Vitamin D is difficult to capture via FFQ because its primary source is sunlight synthesis, which is not a food, and food sources are few and variable.

Question 43: A food frequency questionnaire (FFQ) is BEST suited for which of the following research purposes?

Ranking individuals by dietary exposure in epidemiological studies (Correct answer)
Clinical nutrition therapy planning
Monitoring daily intake changes
Precise individual nutrient quantification

Correct answer: Ranking individuals by dietary exposure in epidemiological studies

FFQs are designed to rank individuals by long-term dietary patterns and are widely used in large-scale epidemiological research.

Question 44: How does documentation support quality in Lifecycle Nutrition?

It only serves administrative purposes
It is only for billing
Documentation is unnecessary overhead
It creates records, ensures consistency, and enables improvement (Correct answer)

Correct answer: It creates records, ensures consistency, and enables improvement

Proper documentation creates accountability, ensures consistency, supports quality improvement, and provides legal protection.

Question 45: Under the Code of Ethics for the Nutrition and Dietetics Profession, which principle requires RDNs to act in the best interest of the public?

Nonmaleficence
Beneficence (Correct answer)
Autonomy
Fidelity

Correct answer: Beneficence

Beneficence is the ethical principle that obligates practitioners to act in the best interest and welfare of their clients and the public.

Question 46: Which of the following best describes the RDN's role when working as part of an interprofessional healthcare team?

Collaborating with team members while contributing nutrition expertise to shared patient goals (Correct answer)
Deferring all clinical decisions to the physician in charge
Limiting communication to written notes in the patient's chart
Independently making all nutrition-related decisions without consulting other team members

Correct answer: Collaborating with team members while contributing nutrition expertise to shared patient goals

RDNs function as collaborative team members who contribute their specialized nutrition knowledge toward shared patient care goals.

Question 47: What is a key role of an RDN in community nutrition?

Conducting laboratory research on nutrient metabolism
Educating populations about healthy eating practices (Correct answer)
Creating policies for food labeling
Managing foodservice operations in hospitals

Correct answer: Educating populations about healthy eating practices

In community nutrition, RDNs focus on improving the health of groups and populations rather than individuals. A key role involves developing and implementing educational programs and campaigns to promote healthy eating practices and prevent nutrition-related diseases. This often includes working in public health agencies, schools, or non-profit organizations to reach diverse communities.

Question 48: A client asks an RDN about a trending diet they read about on social media. The RDN is unfamiliar with the diet. What is the most appropriate immediate response?

Advise the client to follow the diet since social media trends are usually reliable
Dismiss the question as outside the scope of the counseling session
Tell the client the diet is likely harmful without reviewing the information
Acknowledge unfamiliarity, offer to research it, and schedule a follow-up to discuss the findings (Correct answer)

Correct answer: Acknowledge unfamiliarity, offer to research it, and schedule a follow-up to discuss the findings

Acknowledging limitations and committing to evidence-based follow-up models intellectual honesty and professional integrity.

Question 49: When storing foods in a walk-in refrigerator, which storage order from top to bottom is correct according to food safety guidelines?

Whole poultry → ground meats → whole cuts of beef → seafood → ready-to-eat foods
Seafood → whole cuts of beef → ground meats → whole poultry → ready-to-eat foods
Ready-to-eat foods → whole poultry → ground meats → seafood → whole cuts of beef
Ready-to-eat foods → whole seafood → whole cuts of beef → ground meats → whole poultry (Correct answer)

Correct answer: Ready-to-eat foods → whole seafood → whole cuts of beef → ground meats → whole poultry

Foods should be stored based on their required minimum internal cooking temperatures, with ready-to-eat foods on top and foods requiring the highest cooking temperature (poultry) on the bottom.

Question 50: Which element is essential when documenting a nutrition intervention in the ADIME format?

The dietitian's personal opinion about the patient's prognosis
The patient's complete medical history
A list of all foods the patient has eaten in the past week
The specific nutrition diagnosis addressed and the intervention prescribed (Correct answer)

Correct answer: The specific nutrition diagnosis addressed and the intervention prescribed

ADIME documentation requires linking the intervention directly to the identified nutrition diagnosis with specifics of what was prescribed.

Question 51: What is the difference between generic and brand-name drugs?

Generic drugs have the same active ingredient but different name and typically lower cost (Correct answer)
Brand names are always better
There is no difference
Generic drugs are less effective

Correct answer: Generic drugs have the same active ingredient but different name and typically lower cost

Generic drugs contain the same active ingredients, dosage, and route as brand-name drugs but are marketed under their chemical name at lower cost after patent expiration.

Question 52: Why is continuing education important in Community Nutrition?

To stay current with evolving standards and practices (Correct answer)
It is not important after certification
Only for re-certification requirements
To network only

Correct answer: To stay current with evolving standards and practices

Continuing education keeps professionals updated with the latest developments, standards, and best practices in their field.

Question 53: Which of the following is an example of an RDN demonstrating leadership in the workplace?

Completing assigned tasks without seeking additional responsibilities
Mentoring a new dietitian and advocating for improved nutrition services within the organization (Correct answer)
Limiting professional involvement to direct patient care only
Deferring all decisions to administrative staff

Correct answer: Mentoring a new dietitian and advocating for improved nutrition services within the organization

Leadership in dietetics includes mentoring colleagues and advocating for the value of nutrition services within healthcare organizations.

Question 54: What role does ethics play in Community Nutrition practice?

It only applies to managers
It guides professional conduct and protects stakeholders (Correct answer)
It only matters for legal compliance
Ethics is optional in professional settings

Correct answer: It guides professional conduct and protects stakeholders

Professional ethics provide frameworks for responsible decision-making, ensuring practitioners act in the best interest of those they serve.

Question 55: In HACCP, a Critical Control Point (CCP) is best defined as:

A step where control can be applied to prevent or eliminate a food safety hazard (Correct answer)
A record-keeping checkpoint in the food process
The final inspection before food is served
Any point in production where a quality check occurs

Correct answer: A step where control can be applied to prevent or eliminate a food safety hazard

A CCP is a specific point in the food production process where a control measure can be applied to prevent, eliminate, or reduce a food safety hazard to an acceptable level.

Question 56: An odds ratio (OR) of 0.5 in a case-control study examining dietary fiber intake and colon cancer risk MOST suggests:

50% of study participants developed colon cancer
High fiber intake is associated with half the odds of developing colon cancer (Correct answer)
There is no meaningful association between fiber intake and colon cancer risk
High fiber intake is associated with twice the odds of developing colon cancer

Correct answer: High fiber intake is associated with half the odds of developing colon cancer

An OR of 0.5 indicates that the exposed group (high fiber intake) had half the odds of the outcome (colon cancer) compared to the unexposed group, suggesting a protective effect.

Question 57: Which temperature range defines the 'danger zone' for bacterial growth in foods?

32°F–120°F (0°C–49°C)
50°F–165°F (10°C–74°C)
35°F–150°F (2°C–66°C)
40°F–140°F (4°C–60°C) (Correct answer)

Correct answer: 40°F–140°F (4°C–60°C)

The USDA and FDA define the temperature danger zone as 40°F to 140°F, where most pathogenic bacteria multiply rapidly.

Question 58: A client's serum ferritin is low but hemoglobin is normal. Which dietary assessment focus is MOST relevant?

Calcium and vitamin D intake
Folate and choline sources
Dietary iron sources and absorption enhancers/inhibitors (Correct answer)
Vitamin B12 sources

Correct answer: Dietary iron sources and absorption enhancers/inhibitors

Low ferritin indicates depleted iron stores (early iron deficiency), so assessing dietary iron intake, enhancers (vitamin C), and inhibitors (phytates, polyphenols) is most relevant.

Question 59: A dietary intervention reduces cardiovascular disease risk from 20% to 15%. The relative risk reduction (RRR) is:

25% (Correct answer)
15%
5%
75%

Correct answer: 25%

RRR = (control event rate − intervention event rate) ÷ control event rate = (20% − 15%) ÷ 20% = 25%.

Question 60: Which of the following is required for RDN credential maintenance?

Retaking the CDR exam every 10 years
Completing a new degree every 5 years
Ongoing professional education (Correct answer)
Only state licensure renewal

Correct answer: Ongoing professional education

To maintain the RDN credential, Registered Dietitian Nutritionists are required to complete ongoing professional education, also known as continuing professional education (CPE) units. This ensures that RDNs stay current with the latest scientific advancements, practice guidelines, and ethical standards in the field of nutrition and dietetics. This commitment to lifelong learning is essential for competent practice.

Question 61: What is the relationship between theory and practice in Nutritional Biochemistry?

Theory is unnecessary
Practice is unnecessary if you know theory
Theory provides the foundation; practice applies it to real situations (Correct answer)
They are completely separate

Correct answer: Theory provides the foundation; practice applies it to real situations

Theory provides the conceptual foundation and principles, while practice involves applying those concepts to real-world situations. Both are essential for competence.

Question 62: A systematic review with meta-analysis is considered which level of evidence in evidence-based dietetics practice?

Level IV — the lowest level of evidence
Level II evidence
Level I — the highest level of evidence (Correct answer)
Level III evidence

Correct answer: Level I — the highest level of evidence

Systematic reviews with meta-analyses represent Level I evidence, the highest quality in evidence-based practice hierarchies, because they synthesize data from multiple high-quality studies.

Question 63: A patient on warfarin therapy asks about vitamin K intake. The best dietary counseling advice is to:

Avoid all green vegetables permanently
Increase vitamin K to counteract warfarin
Eliminate all vitamin K-containing foods
Maintain a consistent daily intake of vitamin K-rich foods (Correct answer)

Correct answer: Maintain a consistent daily intake of vitamin K-rich foods

Consistency in vitamin K intake allows stable INR management; sudden increases or decreases can destabilize anticoagulation therapy.

Question 64: What is the primary purpose of professional certification in Lifecycle Nutrition?

To validate competency and knowledge in the field (Correct answer)
To replace practical experience
To increase salary automatically
To meet legal requirements only

Correct answer: To validate competency and knowledge in the field

Certification validates that a professional has met established standards of knowledge and competency in Lifecycle Nutrition.

Question 65: When should you change an answer on a test?

Change every answer you doubt
Always change your first answer
Never change answers
Only when you have a clear reason the new answer is better (Correct answer)

Correct answer: Only when you have a clear reason the new answer is better

Research shows changing answers is beneficial only when you have a specific reason, such as recalling new information or catching a misread question.

Question 66: A patient with chronic kidney disease (CKD) stage 4 who is not on dialysis should have their dietary protein intake restricted to approximately:

1.5 g/kg/day
0.8 g/kg/day
0.6–0.8 g/kg/day (Correct answer)
1.2 g/kg/day

Correct answer: 0.6–0.8 g/kg/day

For non-dialysis CKD patients, protein restriction of 0.6–0.8 g/kg/day helps slow progression and reduce uremic symptoms.

Question 67: Which biomarker is used to validate protein intake reported on dietary assessment tools?

Serum prealbumin
Serum albumin
C-reactive protein
24-hour urinary nitrogen (Correct answer)

Correct answer: 24-hour urinary nitrogen

24-hour urinary nitrogen output is a reliable biomarker for verifying dietary protein intake because urinary urea nitrogen reflects protein catabolism.

Question 68: In the evidence hierarchy used by the Academy of Nutrition and Dietetics, which type of evidence is placed at the LOWEST level?

Randomized controlled trial
Prospective cohort study
Expert opinion, editorials, or anecdotal reports (Correct answer)
Systematic review or meta-analysis

Correct answer: Expert opinion, editorials, or anecdotal reports

Expert opinion, editorials, and anecdotal evidence represent the lowest level of evidence because they are not based on systematic research methodology and are highly susceptible to individual bias.

Question 69: Which of the following lab values is most indicative of long-term glycemic control in a patient with type 2 diabetes?

C-peptide level
Hemoglobin A1c (HbA1c) (Correct answer)
Fasting blood glucose
Postprandial glucose

Correct answer: Hemoglobin A1c (HbA1c)

HbA1c reflects average blood glucose over the preceding 2–3 months and is the gold standard for monitoring long-term glycemic control.

Question 70: Which of the following best describes the primary focus of clinical nutrition?

Planning menus for restaurants
Developing dietary plans for individuals with medical conditions (Correct answer)
Conducting public health nutrition campaigns
Researching food product development

Correct answer: Developing dietary plans for individuals with medical conditions

Clinical nutrition primarily focuses on providing medical nutrition therapy to individuals in healthcare settings. This involves assessing patients' nutritional status, diagnosing nutrition-related problems, and developing individualized dietary plans to manage or treat various medical conditions. RDNs in clinical roles work closely with other healthcare professionals to optimize patient outcomes.

Question 71: What is the primary accrediting body for dietetics education programs in the United States?

Accreditation Council for Education in Nutrition and Dietetics (ACEND) (Correct answer)
National Nutrition Council
Commission on Dietetic Registration (CDR)
American Dietetic Association

Correct answer: Accreditation Council for Education in Nutrition and Dietetics (ACEND)

The Accreditation Council for Education in Nutrition and Dietetics (ACEND) is the sole accrediting agency for education programs preparing students for careers as RDNs and Nutrition and Dietetics Technicians, Registered (NDTRs). ACEND ensures these programs meet rigorous standards for quality and effectiveness. This accreditation is crucial for graduates to be eligible for supervised practice and the RDN examination.

Question 72: An RDN discovers a billing error that resulted in overcharging a patient's insurance. What is the most ethical course of action?

Wait to see if the patient or insurance company raises the issue
Ignore the error if the insurance company has not noticed
Report the error to the appropriate billing department and take steps to correct it (Correct answer)
Document the error privately but take no action

Correct answer: Report the error to the appropriate billing department and take steps to correct it

RDNs are ethically obligated to report and correct billing errors to uphold honesty and integrity in professional practice.

Question 73: What is the fire triangle?

Heat, fuel, and oxygen — the three elements needed for fire (Correct answer)
Three types of fire extinguishers
Three fire escape routes
Three fire departments

Correct answer: Heat, fuel, and oxygen — the three elements needed for fire

The fire triangle illustrates the three elements required for combustion: heat (ignition source), fuel (combustible material), and oxygen. Removing any one element extinguishes the fire.

Question 74: An Institutional Review Board (IRB) in research is PRIMARILY responsible for:

Publishing and peer-reviewing nutrition research manuscripts
Evaluating the statistical methods and power calculations of research studies
Protecting the rights, safety, and welfare of human research participants (Correct answer)
Providing funding and grants for approved nutrition research studies

Correct answer: Protecting the rights, safety, and welfare of human research participants

IRBs review research protocols involving human subjects to ensure ethical standards are met, focusing on protecting participant rights, safety, and welfare before and during a study.

Question 75: A hemodialysis patient presents with hyperkalemia. In addition to dialysis adequacy, which dietary counseling is most appropriate?

Increase raw fruit and vegetable intake for antioxidants
Restrict all carbohydrates to lower potassium
Leach or double-boil potatoes and vegetables to reduce potassium content (Correct answer)
Recommend a potassium supplement to balance electrolytes

Correct answer: Leach or double-boil potatoes and vegetables to reduce potassium content

Leaching high-potassium vegetables by peeling, cutting small, soaking in water, and boiling with discarded water can reduce their potassium content by 30–50%.

Question 76: Which mycotoxin, produced by Aspergillus molds, is a potent hepatocarcinogen and a significant food safety concern in corn and peanuts?

Fumonisins
Aflatoxin (Correct answer)
Ochratoxin A
Deoxynivalenol

Correct answer: Aflatoxin

Aflatoxins, particularly aflatoxin B1, are produced by Aspergillus flavus and A. parasiticus and are among the most potent naturally occurring carcinogens known.

Question 77: Which of the following is a key principle of the 'ecological momentary assessment' (EMA) approach to dietary data collection?

Collecting dietary data at a single clinic visit
Capturing real-time food intake reports in naturalistic settings (Correct answer)
Reviewing grocery purchase receipts to estimate intake
Using population-level food supply data

Correct answer: Capturing real-time food intake reports in naturalistic settings

EMA captures dietary intake in real time using mobile devices, reducing recall bias by prompting participants to report immediately after eating.

Question 78: Which of the following BEST describes the purpose of using doubly labeled water (DLW) in dietary assessment research?

To provide an objective estimate of total energy expenditure for validating self-reported energy intake (Correct answer)
To assess hydration status in athletes
To measure basal metabolic rate under controlled conditions
To measure gastrointestinal absorption of nutrients

Correct answer: To provide an objective estimate of total energy expenditure for validating self-reported energy intake

DLW measures carbon dioxide production over 1-2 weeks, providing an objective measure of total energy expenditure used to validate (and reveal errors in) self-reported energy intake.

Question 79: What is a drug contraindication?

A positive drug interaction
A condition that makes a particular treatment inadvisable (Correct answer)
A dosage calculation
A drug recommendation

Correct answer: A condition that makes a particular treatment inadvisable

A contraindication is a specific situation where a drug should not be used because it may be harmful to the patient.

Question 80: A dietitian notices a colleague consistently providing outdated nutritional advice that contradicts current evidence-based guidelines. What is the most appropriate professional response?

Ignore the situation to avoid workplace conflict
Report the colleague to state licensing board immediately
Privately discuss the concern with the colleague and offer current evidence resources (Correct answer)
Correct the colleague's advice directly in front of patients

Correct answer: Privately discuss the concern with the colleague and offer current evidence resources

The ethical and professional approach is to address the concern privately with the colleague while promoting evidence-based practice.

Question 81: What is the primary purpose of the Commission on Dietetic Registration (CDR) Professional Development Portfolio?

To track an RDN's work history and salary progression
To document patient outcomes for quality improvement
To provide legal documentation in malpractice cases
To ensure RDNs engage in ongoing learning relevant to their area of practice (Correct answer)

Correct answer: To ensure RDNs engage in ongoing learning relevant to their area of practice

The CDR Professional Development Portfolio requires RDNs to complete continuing education that is relevant and applicable to their individual scope of practice.

Question 82: When using anthropometric data as part of dietary assessment, which measurement provides the best surrogate for visceral adiposity?

Waist circumference (Correct answer)
BMI
Mid-arm muscle circumference
Triceps skinfold

Correct answer: Waist circumference

Waist circumference is the preferred anthropometric proxy for visceral (abdominal) adiposity and associated metabolic risk.

Question 83: A number needed to treat (NNT) of 10 for a nutrition intervention means:

10 patients must be treated before one adverse event occurs
10 patients must receive the treatment for one additional patient to benefit compared to control (Correct answer)
10 patients dropped out of the study before completion
The treatment is effective in only 10% of patients

Correct answer: 10 patients must receive the treatment for one additional patient to benefit compared to control

NNT is the number of patients who need to receive a treatment for one additional patient to benefit compared to those receiving the control, and is calculated as 1 ÷ absolute risk reduction.

Question 84: An RDN employed by a food company is asked to endorse a product that lacks strong scientific support. According to professional ethics, what should the RDN do?

Ask a colleague to endorse the product instead
Endorse the product only if the company provides a financial incentive
Endorse the product to maintain employment
Decline the endorsement as it conflicts with evidence-based practice and public trust (Correct answer)

Correct answer: Decline the endorsement as it conflicts with evidence-based practice and public trust

RDNs must not make false or misleading claims about products, as this violates the Code of Ethics and undermines public trust.

Question 85: A dietitian is reviewing a client's food diary and notices repeated entries of 'coffee with cream and sugar.' Which assessment step is MOST important next?

Exclude the entry as too vague to analyze
Probe for specific quantities, type of cream, and amount of sugar per cup (Correct answer)
Accept the entry as sufficient detail
Estimate based on a standard recipe

Correct answer: Probe for specific quantities, type of cream, and amount of sugar per cup

Probing for specific details—ounces of cream, teaspoons of sugar, cup size, number of cups—is essential to accurately quantify energy and macronutrient contribution from this repeated item.

Question 86: A prospective cohort study design in nutritional epidemiology is characterized by:

Randomly assigning participants to different dietary intervention groups
Identifying people with and without a disease and then looking backward at their past dietary history
Measuring dietary intake at a single point in time without follow-up
Following disease-free individuals forward in time and observing who develops disease based on dietary patterns (Correct answer)

Correct answer: Following disease-free individuals forward in time and observing who develops disease based on dietary patterns

Prospective cohort studies enroll disease-free individuals, collect baseline dietary data, and follow them forward over time to observe incident disease, allowing assessment of temporal exposure-outcome relationships.

Question 87: A patient with heart failure is prescribed a fluid restriction of 1.5 L/day. Which food item is most important to count toward this fluid allotment?

Gelatin desserts (Correct answer)
Dry crackers
Bread
Cheese

Correct answer: Gelatin desserts

Foods that are liquid at room temperature, including gelatin, ice cream, and soups, must be counted in fluid restriction for heart failure patients.

Question 88: Why is continuing education important in Lifecycle Nutrition?

It is not important after certification
To stay current with evolving standards and practices (Correct answer)
To network only
Only for re-certification requirements

Correct answer: To stay current with evolving standards and practices

Continuing education keeps professionals updated with the latest developments, standards, and best practices in their field.

Question 89: What role does ethics play in Lifecycle Nutrition practice?

It only matters for legal compliance
Ethics is optional in professional settings
It guides professional conduct and protects stakeholders (Correct answer)
It only applies to managers

Correct answer: It guides professional conduct and protects stakeholders

Professional ethics provide frameworks for responsible decision-making, ensuring practitioners act in the best interest of those they serve.

Question 90: Which indicator is most useful for monitoring adequacy of MNT in a patient receiving long-term home parenteral nutrition (HPN)?

Daily urine output
Body weight alone
Regular assessment of functional status, weight, labs, and trace minerals (Correct answer)
Weekly prealbumin levels

Correct answer: Regular assessment of functional status, weight, labs, and trace minerals

Monitoring HPN adequacy requires a comprehensive approach including functional status, weight trends, metabolic labs, and trace mineral levels to detect deficiencies and complications.

Question 91: Valid informed consent for a nutrition research study requires that participants:

Sign a legal liability waiver releasing researchers from all responsibility
Voluntarily agree to participate after receiving adequate information about the study's purpose, risks, benefits, and right to withdraw (Correct answer)
Hold at minimum a college degree to ensure they comprehend study risks
Be randomized to a group assignment before providing consent

Correct answer: Voluntarily agree to participate after receiving adequate information about the study's purpose, risks, benefits, and right to withdraw

Informed consent protects participant autonomy by ensuring they voluntarily agree to participate only after fully understanding the study's purpose, procedures, potential risks and benefits, and their right to withdraw at any time.

Question 92: According to FDA guidelines, what is the maximum time ready-to-eat refrigerated foods can be held after preparation before they must be discarded?

3 days
5 days
10 days
7 days (Correct answer)

Correct answer: 7 days

The FDA Food Code specifies that ready-to-eat foods prepared from commercially processed ingredients can be held for a maximum of 7 days at 41°F or lower.

Question 93: An RDN is hired as an expert witness in a legal case involving nutritional malpractice. Which of the following best describes this role?

Advocating for the plaintiff's position regardless of the evidence
Providing objective, evidence-based testimony within the RDN's area of expertise (Correct answer)
Refusing to participate to avoid liability
Interpreting legal statutes related to the case

Correct answer: Providing objective, evidence-based testimony within the RDN's area of expertise

Expert witnesses provide objective, factual testimony based on their professional expertise to assist the court in understanding complex technical issues.

Question 94: How does documentation support quality in Food Service Management?

It creates records, ensures consistency, and enables improvement (Correct answer)
It only serves administrative purposes
It is only for billing
Documentation is unnecessary overhead

Correct answer: It creates records, ensures consistency, and enables improvement

Proper documentation creates accountability, ensures consistency, supports quality improvement, and provides legal protection.

Question 95: A patient with gestational diabetes mellitus (GDM) has fasting glucose consistently above 95 mg/dL despite MNT. The dietitian should recommend:

Eliminate all carbohydrates from the diet
Double the protein intake to slow gastric emptying
Increase physical activity and reassess within one week
Inform the physician, as pharmacologic therapy may be required (Correct answer)

Correct answer: Inform the physician, as pharmacologic therapy may be required

When MNT alone fails to achieve fasting glucose targets in GDM, the dietitian should communicate findings to the physician promptly as insulin or pharmacologic therapy is likely needed to prevent adverse fetal outcomes.

Question 96: Which serum marker is most reliable for assessing visceral protein status in the context of acute illness or inflammation?

Transferrin
Prealbumin
C-reactive protein (CRP) (Correct answer)
Albumin

Correct answer: C-reactive protein (CRP)

CRP is the most reliable indicator because albumin and prealbumin are negative acute-phase reactants that fall with inflammation regardless of nutritional status, making CRP essential for interpreting protein markers.

Question 97: In which situation is collaboration an essential skill for an RDN?

Advising a patient as part of a healthcare team (Correct answer)
Working independently on a dietary study
Delivering a nutrition seminar to the public
Calculating food costs for a catering company

Correct answer: Advising a patient as part of a healthcare team

Collaboration is a critical skill for RDNs, particularly when working within a healthcare team. When advising a patient, an RDN must effectively communicate and coordinate with physicians, nurses, and other specialists to ensure a holistic and integrated approach to patient care. This teamwork ensures that nutrition interventions align with the patient's overall medical treatment plan.

Question 98: Which dietary pattern assessment approach uses predefined scores to measure adherence to a specific dietary pattern (e.g., Mediterranean diet)?

Principal component analysis
Cluster analysis
Nutrient profiling
Dietary index scoring (Correct answer)

Correct answer: Dietary index scoring

Dietary index scoring assigns points based on adherence to specific food group recommendations within a defined pattern, yielding an overall diet quality score.

Question 99: Which pathogen is most commonly associated with undercooked poultry and is the leading cause of bacterial foodborne illness in the US?

Salmonella (Correct answer)
Yersinia enterocolitica
Clostridium perfringens
Listeria monocytogenes

Correct answer: Salmonella

Salmonella is the most common bacterial cause of foodborne illness in the US and is frequently linked to undercooked poultry and eggs.

Question 100: A patient with end-stage renal disease on peritoneal dialysis has persistent malnutrition. Which unique nutrient consideration applies to peritoneal dialysis compared to hemodialysis?

Protein requirements are lower than for hemodialysis
Sodium restriction is unnecessary in peritoneal dialysis
Significant glucose absorption from dialysate must be counted in caloric intake (Correct answer)
Higher potassium restriction is needed

Correct answer: Significant glucose absorption from dialysate must be counted in caloric intake

Peritoneal dialysis uses a glucose-based dialysate that provides a significant and often unrecognized caloric load (400–800 kcal/day), which must be factored into total energy calculations to prevent obesity and dyslipidemia.

Question 101: What is preventive maintenance?

Cleaning only
Fixing equipment after it breaks
Replacing all equipment annually
Regular scheduled maintenance to prevent equipment failure (Correct answer)

Correct answer: Regular scheduled maintenance to prevent equipment failure

Preventive maintenance involves regular, scheduled inspections and servicing to prevent unexpected breakdowns and extend equipment life.

Question 102: Which of the following best describes the RDN's role in public health nutrition advocacy?

Lobbying only for policies that directly benefit the dietetics profession
Using evidence-based knowledge to advocate for food and nutrition policies that improve population health (Correct answer)
Limiting advocacy to individual patient-level education
Avoiding political involvement to maintain professional neutrality

Correct answer: Using evidence-based knowledge to advocate for food and nutrition policies that improve population health

RDNs have a professional and ethical responsibility to apply their expertise toward advocating for evidence-based policies that improve public health outcomes.

Question 103: How does documentation support quality in Nutritional Biochemistry?

It creates records, ensures consistency, and enables improvement (Correct answer)
It only serves administrative purposes
Documentation is unnecessary overhead
It is only for billing

Correct answer: It creates records, ensures consistency, and enables improvement

Proper documentation creates accountability, ensures consistency, supports quality improvement, and provides legal protection.

Question 104: An RDN working in private practice receives a subpoena for a client's medical nutrition therapy records. What is the appropriate response?

Destroy the records to protect the client's privacy
Release all records immediately without reviewing the subpoena details
Refuse the subpoena as it violates HIPAA
Consult with a legal advisor and comply with the subpoena according to applicable law (Correct answer)

Correct answer: Consult with a legal advisor and comply with the subpoena according to applicable law

A valid legal subpoena may override normal HIPAA protections, so the RDN should seek legal counsel and comply with applicable laws.

Question 105: A patient undergoing chemotherapy for colorectal cancer develops mucositis and is unable to tolerate solid foods. The most appropriate MNT intervention is:

Withhold all nutrition until mucositis resolves
Begin parenteral nutrition immediately
Initiate nasojejunal tube feeding with elemental formula
Transition to soft, cool, non-acidic foods or oral supplements (Correct answer)

Correct answer: Transition to soft, cool, non-acidic foods or oral supplements

For mild-to-moderate chemotherapy-induced mucositis, modifying food texture and temperature to soft, cool, non-irritating options or oral supplements maintains oral intake before escalating to artificial nutrition.

Question 106: When calculating nutrient intake from a food diary, which database is most commonly used in clinical practice in the United States?

Canadian Nutrient File
EFSA FoodEx2
USDA FoodData Central (Correct answer)
FAO/INFOODS database

Correct answer: USDA FoodData Central

USDA FoodData Central is the primary nutrient database used in the US for clinical and research dietary analysis.

Question 107: A hospital dietitian is planning menus for immunocompromised patients. Which food should be EXCLUDED due to Listeria risk?

Pasteurized cheese slices
Canned vegetables heated to 165°F
Cold deli meats served without reheating (Correct answer)
Hard-boiled eggs kept refrigerated

Correct answer: Cold deli meats served without reheating

Listeria monocytogenes can grow at refrigerator temperatures, making ready-to-eat deli meats a high risk for immunocompromised individuals unless reheated to 165°F.

Question 108: Why is continuing education important in Nutritional Biochemistry?

Only for re-certification requirements
To stay current with evolving standards and practices (Correct answer)
It is not important after certification
To network only

Correct answer: To stay current with evolving standards and practices

Continuing education keeps professionals updated with the latest developments, standards, and best practices in their field.

Question 109: What is the primary purpose of professional certification in Food Service Management?

To replace practical experience
To validate competency and knowledge in the field (Correct answer)
To meet legal requirements only
To increase salary automatically

Correct answer: To validate competency and knowledge in the field

Certification validates that a professional has met established standards of knowledge and competency in Food Service Management.

Question 110: What are standard precautions in healthcare?

Using masks during surgery only
Treating all blood and body fluids as potentially infectious (Correct answer)
Only wearing gloves for known infections
Hand washing after patient contact only

Correct answer: Treating all blood and body fluids as potentially infectious

Standard precautions assume all blood and body fluids are potentially infectious, requiring consistent use of barriers (gloves, gowns, masks) and hand hygiene for all patient interactions.

Question 111: What is the most effective study technique according to research?

Highlighting text
Listening to music while studying
Active recall with spaced repetition (Correct answer)
Re-reading notes multiple times

Correct answer: Active recall with spaced repetition

Active recall (testing yourself) combined with spaced repetition (reviewing at intervals) is the most effective study method per cognitive science research.

Question 112: In a critically ill patient receiving enteral nutrition, which finding best indicates that gastric feeding should be held and a different approach considered?

Soft bowel sounds present
Blood glucose of 160 mg/dL
Gastric residual volume of 150 mL
Persistent vomiting with signs of aspiration risk (Correct answer)

Correct answer: Persistent vomiting with signs of aspiration risk

Persistent vomiting with aspiration risk is a clinical indication to hold gastric feeding and consider post-pyloric feeding, as GRV alone is no longer used as the primary indicator for intolerance.

Question 113: Which degree is the minimum requirement to become a Registered Dietitian Nutritionist (RDN)?

Doctoral Degree
Master’s Degree
Associate’s Degree
Bachelor’s Degree (Correct answer)

Correct answer: Bachelor’s Degree

To become a Registered Dietitian Nutritionist (RDN), candidates must complete a minimum of a bachelor's degree from an accredited program. This degree provides the foundational knowledge in nutrition science, food systems, and dietetics practice. While advanced degrees are common, the bachelor's degree is the initial educational prerequisite for eligibility.

Question 114: What is the purpose of a risk assessment?

To identify potential hazards and determine mitigation measures (Correct answer)
To calculate financial budgets
To assign work shifts
To track inventory levels

Correct answer: To identify potential hazards and determine mitigation measures

Risk assessments identify potential hazards, evaluate the likelihood and severity of harm, and determine appropriate controls to minimize risk.

Question 115: A food handler returns to work after recovering from a confirmed Norovirus illness. When is it safe to resume food handling duties?

After completing a full course of antibiotics
24 hours after last vomiting episode
After being symptom-free for at least 48 hours (Correct answer)
As soon as a doctor clears them

Correct answer: After being symptom-free for at least 48 hours

FDA Food Code requires food handlers to be symptom-free for at least 48 hours after the last episode of vomiting or diarrhea before returning to work.

Question 116: In a single-blind clinical nutrition trial, which party is unaware of the group assignment?

Only the biostatisticians analyzing the data do not know the group assignments
Neither participants nor researchers know the group assignments
Only the researchers and data collectors do not know the group assignments
Only the participants do not know their group assignment (Correct answer)

Correct answer: Only the participants do not know their group assignment

In a single-blind trial, participants do not know whether they are receiving the active intervention or control, which reduces placebo effects and response bias.

Question 117: In which area might an RDN specialize to work with athletes?

Sports Dietetics (Correct answer)
Geriatric Nutrition
Renal Nutrition
Pediatric Nutrition

Correct answer: Sports Dietetics

Sports dietetics is a specialized area of practice where RDNs apply nutrition science to enhance athletic performance, recovery, and overall health. RDNs specializing in sports dietetics work with athletes of all levels, providing individualized nutrition counseling, hydration strategies, and meal planning. This specialization addresses the unique energy and nutrient demands of physical activity.

Question 118: A school nutrition program is assessing food allergy protocols. Which of the following is classified as one of the FDA's 'Big Nine' major food allergens?

Peas
Sesame (Correct answer)
Gelatin
Corn

Correct answer: Sesame

As of January 1, 2023, sesame became the 9th major food allergen recognized by the FDA under FALCPA, joining milk, eggs, fish, shellfish, tree nuts, peanuts, wheat, and soybeans.

Question 119: The 'flat slope syndrome' in dietary assessment describes a situation where:

Portion sizes are systematically overestimated
High consumers under-report and low consumers over-report (Correct answer)
Energy intake remains constant across different activity levels
All respondents report similar intakes regardless of true variation

Correct answer: High consumers under-report and low consumers over-report

Flat slope syndrome describes regression to the mean in dietary reporting, where high consumers under-report and low consumers over-report, compressing the true distribution.

Question 120: In a patient with cirrhosis, which MNT strategy helps prevent hepatic encephalopathy while maintaining adequate nutrition?

Provide adequate protein (1.2–1.5 g/kg/day) with branched-chain amino acids if needed (Correct answer)
Use only enteral nutrition, never oral
Restrict protein to 0.5 g/kg/day
Eliminate all aromatic amino acids

Correct answer: Provide adequate protein (1.2–1.5 g/kg/day) with branched-chain amino acids if needed

Current guidelines recommend 1.2–1.5 g protein/kg/day for cirrhosis; protein restriction is no longer advised as it worsens outcomes, and BCAA supplementation may help refractory encephalopathy.

Question 121: The PICO framework is used in evidence-based dietetics practice primarily to:

Calculate estimated caloric requirements for hospitalized patients
Formulate a focused, searchable clinical research question (Correct answer)
Assess a patient's nutritional status at admission
Evaluate food service operations and efficiency

Correct answer: Formulate a focused, searchable clinical research question

PICO (Population, Intervention, Comparison, Outcome) is a structured framework used to formulate focused clinical questions that guide systematic literature searches and evidence-based decisions.

Question 122: Why is continuing education important in Food Service Management?

To stay current with evolving standards and practices (Correct answer)
To network only
Only for re-certification requirements
It is not important after certification

Correct answer: To stay current with evolving standards and practices

Continuing education keeps professionals updated with the latest developments, standards, and best practices in their field.

Question 123: What does 'PRN' mean on a prescription?

Before meals
Twice daily
As needed (Correct answer)
At bedtime

Correct answer: As needed

PRN comes from Latin 'pro re nata' meaning 'as needed.'

Question 124: A patient with phenylketonuria (PKU) becomes pregnant. The most critical MNT intervention before and during pregnancy is:

Maintain strict low-phenylalanine diet with blood Phe levels below 6 mg/dL (Correct answer)
Switch to a high-protein diet for fetal development
Discontinue the PKU formula as it is unnecessary in adults
Increase phenylalanine intake to support fetal growth

Correct answer: Maintain strict low-phenylalanine diet with blood Phe levels below 6 mg/dL

Maternal PKU syndrome causes severe fetal damage; strict control of blood phenylalanine below 6 mg/dL ideally beginning before conception is essential to prevent microcephaly, heart defects, and intellectual disability.

Question 125: In dietary assessment, the term 'portion distortion' refers to:

Systematic underestimation of added fat in cooking
Inaccurate estimation of serving sizes due to increased normative portion sizes over time (Correct answer)
Misclassification of food items in nutrient databases
Confusion between portion size and serving size on food labels

Correct answer: Inaccurate estimation of serving sizes due to increased normative portion sizes over time

Portion distortion describes how people's reference for a 'normal' portion has grown over decades, leading to systematic underestimation of actual intake.

Registration Examination for Dietitians (RDN/RD)

The Commission on Dietetic Registration (CDR) Registration Examination for Dietitians (RD/RDN) is a computer-adaptive test that assesses entry-level competency across nutrition care, dietetic principles, food and nutrition program management, and foodservice systems. Passing is required to earn the Registered Dietitian Nutritionist credential.

125

Questions

180 min

Time Limit

70%

To Pass

Checking for saved progress...

Exam Rules

You can skip questions and return to them later
Flag questions for review before submitting
No feedback shown until you submit the entire exam
Unanswered questions count as wrong — answer everything
10 pretest questions are mixed in and don't affect your score
Timer auto-submits when time runs out
Your progress is auto-saved every 30 seconds

These practice questions were written with AI tools. They are not real exam questions. Exam facts are checked against the official sources listed below. Not reviewed by a subject-matter expert. Editorial policy

Sources & references

Exam facts on this page (fees, format, dates, passing scores) are checked against these official sources; the date is our last check. Editorial policy

admin.cdrnet.org — Exam information · verified Nov 2026
cdrnet.org — Eligibility, fees, exam format, retake fee, time limit, score validity, retake policy, score release, test delivery, test dates · verified Oct 2026