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

Question 1: What is 'emotional eating' and how does it affect weight management?

Eating only foods that make you happy
Eating based on physical hunger signals
Using food to cope with emotions like stress or boredom, often leading to excess calorie intake (Correct answer)
A psychological disorder requiring hospitalization

Correct answer: Using food to cope with emotions like stress or boredom, often leading to excess calorie intake

Emotional eating is using food to manage emotions rather than physical hunger, which frequently leads to overconsumption of calorie-dense foods and undermines weight loss.

Question 2: Which calcium-rich plant-based food is also fortified in many plant milks?

Soy milk and fortified plant milks (Correct answer)
Almonds and almond milk
Broccoli and green peas
Spinach only

Correct answer: Soy milk and fortified plant milks

Fortified soy milk and other plant milks are excellent calcium sources for plant-based eaters, often providing similar calcium levels to cow's milk.

Question 3: Which organ produces ketone bodies during ketosis?

Kidneys
Liver (Correct answer)
Pancreas
Small intestine

Correct answer: Liver

The liver produces ketone bodies (acetoacetate, beta-hydroxybutyrate, and acetone) when glycogen stores are depleted.

Question 4: What is 'NEAT' and why is it important for weight management?

Night Eating Adjustment Technique — adjusting evening meal timing
Nutritional Energy Absorption Test — a measure of nutrient uptake
Non-Essential Amino Tracking — monitoring non-critical proteins
Non-Exercise Activity Thermogenesis — calories burned through daily movement outside formal exercise (Correct answer)

Correct answer: Non-Exercise Activity Thermogenesis — calories burned through daily movement outside formal exercise

NEAT (Non-Exercise Activity Thermogenesis) includes all calories burned through daily activities like walking, fidgeting, and standing, and can vary by up to 2,000 calories per day between individuals.

Question 5: In the list below, which item is NOT a dairy product?

Fromage frais
Yogurt
Veal (Correct answer)
Milk

Correct answer: Veal

Veal is meat from a calf, making it a meat product, not a dairy product. Dairy products are derived from the milk of mammals, such as cows, and include items like yogurt, milk, and fromage frais (a type of fresh cheese). These products are distinct from animal flesh.

Question 6: Which macronutrient plays the most important role in hormone production?

Carbohydrates
Fiber
Dietary fat (Correct answer)
Protein

Correct answer: Dietary fat

Dietary fat is essential for the production of steroid hormones including estrogen, testosterone, and cortisol.

Question 7: Does intermittent fasting significantly slow metabolism compared to continuous calorie restriction?

Yes, it slows metabolism more than regular dieting
No, it doubles metabolic rate
No, it may preserve metabolic rate better than continuous restriction (Correct answer)
Yes, by 20–30% within weeks

Correct answer: No, it may preserve metabolic rate better than continuous restriction

Research suggests intermittent fasting may preserve resting metabolic rate better than continuous calorie restriction, which can more aggressively reduce metabolism.

Question 8: What is the primary benefit of eating a variety of colorful fruits and vegetables?

More protein per serving
Wider range of phytonutrients and vitamins (Correct answer)
Reduced fiber intake
Higher caloric intake

Correct answer: Wider range of phytonutrients and vitamins

Different colors in fruits and vegetables indicate different phytonutrients and vitamins, so variety ensures a broader spectrum of nutrients.

Question 9: Which of the following is a Phase 1 South Beach Diet-approved vegetable?

Carrots
Beets
Spinach (Correct answer)
Corn

Correct answer: Spinach

Spinach is a non-starchy, low-glycemic vegetable permitted freely in Phase 1, while corn, carrots, and beets are higher in sugar and restricted.

Question 10: What is the typical daily carbohydrate limit to maintain ketosis?

100–150 grams
75–100 grams
20–50 grams (Correct answer)
50–75 grams

Correct answer: 20–50 grams

Most ketogenic protocols restrict net carbohydrates to 20–50 grams per day to keep the body in ketosis.

Question 11: What is the 'Warrior Diet' in the context of intermittent fasting?

High-protein eating every 2 hours
Fasting 3 days per week with large meals on other days
Eating raw foods only during a 4-hour window at night
Fasting all day and eating one large meal at night within a 4-hour window (Correct answer)

Correct answer: Fasting all day and eating one large meal at night within a 4-hour window

The Warrior Diet involves eating small amounts of raw fruits and vegetables during the day and consuming one large meal at night within a 4-hour eating window.

Question 12: Which symptom is commonly associated with the initial transition to a ketogenic diet?

Hyperglycemia
Iron deficiency anemia
Hyperthyroidism
Keto flu (Correct answer)

Correct answer: Keto flu

The 'keto flu' is a common set of symptoms (fatigue, headache, irritability) experienced during the first days of starting a ketogenic diet.

Question 13: What is the approximate caloric split (carbs/fat/protein) suggested by the USDA Dietary Guidelines for a balanced diet?

45–65% / 20–35% / 10–35% (Correct answer)
60/20/20
50/40/10
30/50/20

Correct answer: 45–65% / 20–35% / 10–35%

The USDA Dietary Guidelines align with AMDR ranges: 45–65% carbohydrates, 20–35% fat, and 10–35% protein.

Question 14: What role do B vitamins play in exercise performance?

They primarily reduce inflammation post-exercise
They directly build muscle tissue
They serve as coenzymes in energy metabolism, helping convert food into usable ATP (Correct answer)
They increase testosterone production

Correct answer: They serve as coenzymes in energy metabolism, helping convert food into usable ATP

B vitamins such as B1, B2, B3, B6, and B12 are essential cofactors in metabolic pathways that produce ATP from carbohydrates, fats, and protein.

Question 15: Which nutrient timing strategy has been shown to support muscle protein synthesis throughout the day?

Eating protein only immediately pre-workout
Consuming all daily protein in one large evening meal
Avoiding protein before noon
Distributing 20–40 g of protein evenly across 3–5 meals throughout the day (Correct answer)

Correct answer: Distributing 20–40 g of protein evenly across 3–5 meals throughout the day

Distributing protein intake evenly across meals maximizes muscle protein synthesis signaling because each serving stimulates anabolic pathways that a single large dose cannot sustain all day.

Question 16: What is the most common intermittent fasting protocol?

Alternate day fasting
24-hour fast
16:8 method (Correct answer)
5:2 method

Correct answer: 16:8 method

The 16:8 method — fasting for 16 hours and eating within an 8-hour window — is the most popular and widely practiced intermittent fasting protocol.

Question 17: What is 'carbohydrate periodization' in an athletic diet?

Avoiding carbs entirely on rest days
Eating the same amount of carbs every day
Rotating carbohydrate intake based on training intensity and volume (Correct answer)
Consuming only complex carbs during competition

Correct answer: Rotating carbohydrate intake based on training intensity and volume

Carbohydrate periodization means strategically adjusting carb intake to match training demands — more on hard days, less on easy or rest days.

Question 18: What distinguishes a plant-based diet from a vegan diet?

There is no difference between them
Plant-based diets allow fish; vegan diets do not
Plant-based diets focus on whole plant foods and may include small amounts of animal products; veganism excludes all animal products (Correct answer)
Plant-based diets are medically supervised; vegan diets are not

Correct answer: Plant-based diets focus on whole plant foods and may include small amounts of animal products; veganism excludes all animal products

A plant-based diet prioritizes whole plant foods and may allow small amounts of animal products, while veganism is an ethical lifestyle that strictly excludes all animal products.

Question 19: Which macronutrient is the body's preferred primary source of energy?

Protein
Fat
Carbohydrates (Correct answer)
Fiber

Correct answer: Carbohydrates

Carbohydrates are the body's preferred and most readily used source of energy, especially for the brain and muscles.

Question 20: What distinguishes 'good carbs' from 'bad carbs' according to the South Beach Diet framework?

Good carbs have more calories; bad carbs have fewer
Bad carbs are those that contain any fiber
Good carbs are digested slowly with minimal blood sugar impact; bad carbs spike glucose rapidly (Correct answer)
Good carbs come only from animal products

Correct answer: Good carbs are digested slowly with minimal blood sugar impact; bad carbs spike glucose rapidly

Good carbs (whole grains, vegetables, legumes) are digested slowly, providing steady energy, while bad carbs (refined sugars, white flour) cause rapid blood sugar spikes.

Question 21: Which protein source would be most consistent with South Beach Diet Phase 1 guidelines?

Pepperoni pizza
Grilled salmon (Correct answer)
Fried chicken with breading
Breaded fish sticks

Correct answer: Grilled salmon

Grilled salmon provides lean protein and heart-healthy omega-3 fatty acids without the refined carbs found in breaded or fried options.

Question 22: During Phase 2 of the South Beach Diet, how are carbohydrates reintroduced?

Carbs remain completely restricted
Gradually, starting with low-glycemic options (Correct answer)
Only white bread and pasta are permitted
All carbs are allowed immediately

Correct answer: Gradually, starting with low-glycemic options

Phase 2 gradually reintroduces low-glycemic carbohydrates such as whole grains, fruits, and starchy vegetables in moderate amounts.

Question 23: Which vitamin is essential for calcium absorption, which supports bone health during weight-bearing exercise?

Vitamin D (Correct answer)
Vitamin C
Vitamin K
Vitamin A

Correct answer: Vitamin D

Vitamin D regulates calcium absorption in the gut, making it critical for maintaining bone density in athletes and active individuals.

Question 24: What is the primary advantage of chocolate milk as a post-workout recovery beverage?

It provides an ideal 3:1 or 4:1 carbohydrate-to-protein ratio for glycogen replenishment and muscle repair (Correct answer)
It is the lowest sugar option available
It is calorie-free
It contains caffeine to boost the next workout

Correct answer: It provides an ideal 3:1 or 4:1 carbohydrate-to-protein ratio for glycogen replenishment and muscle repair

Chocolate milk naturally provides carbohydrates and protein in a ratio shown to support glycogen resynthesis and muscle protein synthesis after exercise.

Question 25: Dairy consumption in the Mediterranean diet is mainly in what form?

Yogurt and cheese (Correct answer)
Whole milk and butter
Low-fat milk only
Ice cream and cream

Correct answer: Yogurt and cheese

Dairy in the Mediterranean diet is primarily consumed as yogurt (especially Greek yogurt) and cheese in moderate amounts.

Question 26: If someone has successfully completed Phase 1 and Phase 2 but regains weight, what does the South Beach Diet recommend?

Switch entirely to a different diet plan
Permanently stay on Phase 1 restrictions
Return briefly to Phase 1 to reset and then progress through the phases again (Correct answer)
Increase calorie intake to reset metabolism

Correct answer: Return briefly to Phase 1 to reset and then progress through the phases again

The South Beach Diet recommends temporarily returning to the stricter Phase 1 to regain control of cravings and blood sugar, then moving forward through the phases again.

Question 27: Post-exercise muscle protein synthesis is maximally stimulated by consuming approximately how many grams of high-quality protein?

5–10 g
60–80 g
Over 100 g
20–40 g (Correct answer)

Correct answer: 20–40 g

Studies show 20–40 g of leucine-rich protein effectively maximizes muscle protein synthesis; amounts above this offer diminishing returns per meal.

Question 28: How does exercise-induced sweating affect dietary electrolyte needs?

It significantly increases needs for sodium, potassium, and magnesium (Correct answer)
It only increases the need for calcium
It reduces the need for all electrolytes
It has no impact on electrolyte needs

Correct answer: It significantly increases needs for sodium, potassium, and magnesium

Sweat contains electrolytes, particularly sodium, and prolonged exercise increases the need to replenish sodium, potassium, and magnesium to maintain fluid balance and muscle function.

Question 29: Which hormone's sensitivity improves with intermittent fasting?

Testosterone
Insulin (Correct answer)
Cortisol
Thyroid hormone

Correct answer: Insulin

Intermittent fasting improves insulin sensitivity, helping the body manage blood sugar more effectively and reducing the risk of type 2 diabetes.

Question 30: Which condiment would generally be permitted on the South Beach Diet?

Honey mustard dressing with sugar
Sweet barbecue sauce
Mustard (Correct answer)
Ketchup with added sugar

Correct answer: Mustard

Plain mustard is low in sugar and carbohydrates, making it a South Beach Diet-friendly condiment, unlike ketchup or sweet sauces.

Question 31: Which mineral is most critical for oxygen transport in the blood and directly impacts exercise endurance?

Calcium
Magnesium
Zinc
Iron (Correct answer)

Correct answer: Iron

Iron is a core component of hemoglobin, which carries oxygen from the lungs to working muscles during aerobic exercise.

Question 32: What are ketone bodies primarily produced from on a ketogenic diet?

Amino acids
Glucose
Protein
Fatty acids (Correct answer)

Correct answer: Fatty acids

Ketone bodies are produced in the liver primarily from fatty acids when carbohydrate intake is very low.

Question 33: What is 'alternate day fasting' (ADF)?

Alternating between low-calorie and normal eating days (Correct answer)
Fasting every other day completely
Eating only alternating meals throughout the day
Fasting for 36 hours, eating for 12

Correct answer: Alternating between low-calorie and normal eating days

Alternate day fasting alternates between normal eating days and modified fast days where calorie intake is reduced to about 25% of normal needs.

Registration Examination for Dietitians (RD/RDN Exam)

The CDR Registration Examination for Dietitians assesses entry-level competency in nutrition care, dietetics principles, food and nutrition science, and management of food systems to credential Registered Dietitian Nutritionists.

Questions

40 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