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

Question 1: What does BMR (Basal Metabolic Rate) represent?

Calories needed to maintain weight with a sedentary lifestyle
Maximum calorie intake for weight loss
Calories burned during exercise
Calories the body burns at rest to maintain basic physiological functions (Correct answer)

Correct answer: Calories the body burns at rest to maintain basic physiological functions

BMR is the number of calories the body needs to sustain basic functions (breathing, circulation, cell repair) at complete rest.

Question 2: True or false: When more people join a healthy lifestyle plan, weight loss becomes more difficult.

True
False (Correct answer)

Correct answer: False

Joining a healthy lifestyle plan with more people often provides a supportive community, increased motivation, and shared accountability, which can make weight loss easier and more sustainable. Social support is a recognized factor in successful health behavior change.

Question 3: What iodine concern exists for people following a strict plant-based diet?

Plants contain too much iodine, causing thyroid problems
Iodine is irrelevant for plant-based dieters
Plants block iodine absorption completely
Most plant foods are low in iodine unless iodized salt or sea vegetables are included (Correct answer)

Correct answer: Most plant foods are low in iodine unless iodized salt or sea vegetables are included

Most plant foods are naturally low in iodine, so plant-based eaters should use iodized salt, eat sea vegetables, or take an iodine supplement to meet needs.

Question 4: Which electrolyte is most commonly lost and must be supplemented on a ketogenic diet?

Iron
Sodium (Correct answer)
Zinc
Calcium

Correct answer: Sodium

Sodium is rapidly lost through increased urination as insulin levels drop on a ketogenic diet, making supplementation essential.

Question 5: Which outcome is NOT a commonly reported benefit of following the South Beach Diet correctly?

Steady and sustainable weight loss after Phase 1
Improved cholesterol levels
Reduced cravings for sugary foods
Complete elimination of the need for exercise (Correct answer)

Correct answer: Complete elimination of the need for exercise

The South Beach Diet promotes healthy eating patterns but does not claim to eliminate the benefits of exercise; physical activity is still encouraged for overall health.

Question 6: What are ketone bodies primarily produced from on a ketogenic diet?

Protein
Amino acids
Glucose
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 7: True or false: You shouldn't eat fish more than once a month.

False (Correct answer)
True

Correct answer: False

Dietary guidelines from health organizations widely recommend eating fish, especially fatty fish rich in omega-3 fatty acids, at least two times per week for its heart-healthy benefits. Limiting fish consumption to once a month would mean missing out on these important nutritional advantages.

Question 8: Which macronutrient provides 9 calories per gram, the highest of all macronutrients?

Protein
Fat (Correct answer)
Fiber
Carbohydrates

Correct answer: Fat

Dietary fat provides 9 calories per gram, compared to 4 calories per gram for both carbohydrates and protein.

Question 9: Which vitamin requires fat to be properly absorbed in the body?

Vitamin B12
Vitamin C
Vitamin B6
Vitamin D (Correct answer)

Correct answer: Vitamin D

Vitamin D is fat-soluble and requires dietary fat for proper absorption in the digestive tract.

Question 10: How many grams of protein per kilogram of body weight is generally recommended for a sedentary adult?

2.2 g/kg
0.4 g/kg
1.6 g/kg
0.8 g/kg (Correct answer)

Correct answer: 0.8 g/kg

The RDA for protein is 0.8 grams per kilogram of body weight per day for sedentary adults.

Question 11: Foods rich in carbs and starch are crucial because

They stop you from getting overweight
They are easy to cook
They help you grow
They give you energy and fill you up (Correct answer)

Correct answer: They give you energy and fill you up

Carbohydrates, including starches, are the body's primary source of energy. They are broken down into glucose, which fuels all bodily functions and physical activities. Consuming foods rich in carbs and starch also contributes to satiety, helping you feel full and satisfied after meals.

Question 12: Which vitamin is essential for calcium absorption, which supports bone health during weight-bearing exercise?

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

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 13: What is 'carbohydrate periodization' in an athletic diet?

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

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 14: Which nut is most commonly associated with the Mediterranean diet?

Cashews
Almonds and walnuts (Correct answer)
Pecans
Peanuts

Correct answer: Almonds and walnuts

Almonds and walnuts are among the most commonly consumed nuts in the Mediterranean diet and are eaten as snacks or added to meals.

Question 15: What are essential amino acids?

Amino acids used solely for energy production
Amino acids found only in plant foods
Amino acids that must be obtained through diet (Correct answer)
Amino acids the body can produce on its own

Correct answer: Amino acids that must be obtained through diet

Essential amino acids cannot be synthesized by the body and must be consumed through food.

Question 16: Which of these fruits would be most appropriate to introduce during South Beach Diet Phase 2?

Watermelon
Blueberries (Correct answer)
Dates
Canned fruit in syrup

Correct answer: Blueberries

Blueberries have a relatively low glycemic index and are rich in antioxidants, making them a suitable Phase 2 fruit choice.

Question 17: Which countries are considered the traditional origin of the Mediterranean diet?

Greece, Italy, and Spain (Correct answer)
France and Germany
Morocco and Tunisia
Turkey and Egypt

Correct answer: Greece, Italy, and Spain

The Mediterranean diet is rooted in the traditional eating patterns of Greece, Italy, and Spain, regions bordering the Mediterranean Sea.

Question 18: What does DHA and EPA (long-chain omega-3s) conversion from plant-based ALA involve?

Direct conversion with 100% efficiency
Inefficient conversion; algae-based supplements are often recommended (Correct answer)
Conversion only occurs with B12 supplementation
No conversion is possible in humans

Correct answer: Inefficient conversion; algae-based supplements are often recommended

The body converts ALA to DHA and EPA very inefficiently; algae-based omega-3 supplements are often recommended for plant-based eaters as a direct source.

Question 19: Which of the following best describes the Mediterranean diet's approach to sweets and desserts?

Sweets are consumed rarely and are naturally sweetened (e.g., fruit) (Correct answer)
Unlimited consumption of sweets
Artificial sweeteners replace all sugar
Sweets are completely banned

Correct answer: Sweets are consumed rarely and are naturally sweetened (e.g., fruit)

The Mediterranean diet limits sweets and desserts to occasional consumption, with fresh fruit often serving as the preferred sweet ending to a meal.

Question 20: What is the 'Warrior Diet' in the context of intermittent fasting?

Fasting 3 days per week with large meals on other days
Eating raw foods only during a 4-hour window at night
High-protein eating every 2 hours
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 21: The Mediterranean diet is recognized by UNESCO as what?

A protected agricultural designation
A global health standard
A World Heritage dietary pattern
An Intangible Cultural Heritage (Correct answer)

Correct answer: An Intangible Cultural Heritage

UNESCO inscribed the Mediterranean diet as an Intangible Cultural Heritage of Humanity in 2013, recognizing its cultural and health significance.

Question 22: An athlete training twice per day should prioritize which recovery nutrition strategy between sessions?

High-fat meal to replenish energy
A full 3-hour fast to allow muscle repair
Carbohydrate-rich snack within 30 minutes (Correct answer)
High-fiber vegetables only

Correct answer: Carbohydrate-rich snack within 30 minutes

Consuming carbohydrates within 30 minutes post-session rapidly restores glycogen, enabling adequate energy for the second training bout.

Question 23: What is the primary role of carbohydrates in a balanced diet?

Forming hormones
Providing energy (Correct answer)
Building muscle tissue
Transporting fat-soluble vitamins

Correct answer: Providing energy

Carbohydrates are the body's preferred and primary source of energy, particularly for the brain and muscles.

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 calorie-free
It contains caffeine to boost the next workout
It is the lowest sugar option available

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: Which supplement has the strongest evidence for improving high-intensity exercise performance and is approved by major sports organizations?

Collagen peptides
Glutamine
BCAAs alone
Creatine monohydrate (Correct answer)

Correct answer: Creatine monohydrate

Creatine monohydrate is one of the most extensively studied and effective supplements for increasing power output and muscle mass during resistance and high-intensity training.

Question 26: What happens to insulin levels on a ketogenic diet?

They increase significantly
They remain unchanged
They fluctuate randomly
They decrease significantly (Correct answer)

Correct answer: They decrease significantly

Low carbohydrate intake on a ketogenic diet leads to significantly reduced insulin secretion, which promotes fat burning.

Question 27: Which nutrient timing strategy has been shown to support muscle protein synthesis throughout the day?

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

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 28: Which of the following is an example of a whole grain food?

Enriched white bread
Cornstarch
Oatmeal (Correct answer)
White rice

Correct answer: Oatmeal

Oatmeal is made from whole oats and retains the bran, germ, and endosperm, making it a true whole grain food.

Question 29: What is a 'cyclical ketogenic diet' (CKD)?

A diet that cycles between different calorie levels
A diet with 5 low-carb days followed by 1–2 high-carb days (Correct answer)
A diet that rotates macronutrient ratios daily
A diet alternating between keto and Mediterranean protocols

Correct answer: A diet with 5 low-carb days followed by 1–2 high-carb days

A cyclical ketogenic diet involves 5–6 days of standard ketogenic eating followed by 1–2 higher-carb 'refeed' days to replenish glycogen.

Question 30: Caffeine improves exercise performance primarily through which mechanism?

Blocking adenosine receptors to reduce perception of fatigue (Correct answer)
Increasing blood glucose by releasing stored glycogen
Directly increasing muscle fiber size
Elevating body temperature to burn more fat

Correct answer: Blocking adenosine receptors to reduce perception of fatigue

Caffeine competitively blocks adenosine receptors in the brain, reducing the perception of effort and fatigue during exercise.

Question 31: Which calcium-rich plant-based food is also fortified in many plant milks?

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

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 32: A well-planned plant-based diet can be nutritionally complete for which life stages?

Adults and elderly only
All life stages including infancy, childhood, pregnancy, and older adulthood (Correct answer)
Only for people under 50 without health conditions
Adults only

Correct answer: All life stages including infancy, childhood, pregnancy, and older adulthood

Major dietetic associations, including the Academy of Nutrition and Dietetics, state that well-planned plant-based diets are nutritionally adequate for all stages of life.

Question 33: What does 'sustainable weight loss' typically involve according to health guidelines in the US?

Losing 5+ pounds per week through very low calorie diets
Losing as much weight as possible as fast as possible
Rapid initial weight loss followed by maintenance
Losing 1–2 pounds per week through moderate lifestyle changes (Correct answer)

Correct answer: Losing 1–2 pounds per week through moderate lifestyle changes

US health guidelines (CDC, NHLBI) recommend losing 1–2 pounds per week through moderate calorie reduction and increased physical activity as the safest, most sustainable approach.

Question 34: Which nutrient plays the most critical role in maintaining fluid balance in the body?

Sodium (Correct answer)
Iron
Calcium
Zinc

Correct answer: Sodium

Sodium is the primary electrolyte regulating fluid balance, blood pressure, and nerve function in the body.

Question 35: Which symptom is commonly associated with the initial transition to a ketogenic diet?

Hyperglycemia
Keto flu (Correct answer)
Hyperthyroidism
Iron deficiency anemia

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 36: Which nutrient found in plants inhibits iron and zinc absorption and must be considered in plant-based diets?

Carotenoids
Fiber
Phytates (phytic acid) (Correct answer)
Polyphenols

Correct answer: Phytates (phytic acid)

Phytates (phytic acid) in grains, legumes, and seeds bind to minerals like iron and zinc, reducing their absorption in the gut.

Question 37: Which organ produces ketone bodies during ketosis?

Liver (Correct answer)
Kidneys
Small intestine
Pancreas

Correct answer: Liver

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

Question 38: What is the recommended Acceptable Macronutrient Distribution Range (AMDR) for total fat intake?

5–15%
20–35% (Correct answer)
10–20%
35–50%

Correct answer: 20–35%

The AMDR for fat is 20–35% of total daily calories for adults, supporting vital functions without excess.

Question 39: What percentage of total daily calories is generally recommended to come from protein for a healthy adult?

20–40%
45–65%
10–35% (Correct answer)
5–10%

Correct answer: 10–35%

The Acceptable Macronutrient Distribution Range (AMDR) for protein is 10–35% of total daily calories.

Question 40: How many calories does one gram of carbohydrate provide?

4 calories (Correct answer)
7 calories
9 calories
2 calories

Correct answer: 4 calories

Carbohydrates provide 4 calories per gram, the same as protein.

Question 41: How much water should most adults drink daily according to common US health recommendations?

4 cups (1 liter)
8 cups (about 2 liters) (Correct answer)
2 cups (0.5 liters)
16 cups (4 liters)

Correct answer: 8 cups (about 2 liters)

A commonly cited guideline is about 8 cups (roughly 2 liters) of water per day, though actual needs vary by individual.

Question 42: Which medical benefit was the South Beach Diet originally designed to target, beyond weight loss?

Improving bone density
Increasing muscle mass
Reducing cardiovascular disease risk (Correct answer)
Treating type 1 diabetes

Correct answer: Reducing cardiovascular disease risk

Dr. Agatston designed the South Beach Diet primarily to improve his cardiac patients' cholesterol and heart disease risk factors.

Question 43: What is the role of resistance (strength) training in a weight loss program focused on nutrition?

It only matters for muscle building, not weight loss
It should be avoided to prevent increased appetite
It automatically doubles fat loss regardless of diet
It helps preserve lean muscle mass lost during calorie restriction (Correct answer)

Correct answer: It helps preserve lean muscle mass lost during calorie restriction

Resistance training during a calorie deficit helps preserve lean muscle mass, which supports metabolic rate and results in better body composition even at the same weight.

Question 44: True or false: Consuming mono- and polyunsaturated fats rather than saturated or trans fats promotes weight loss.

True
False (Correct answer)

Correct answer: False

While mono- and polyunsaturated fats are healthier for heart health than saturated or trans fats, consuming any type of fat in excess will contribute to weight gain, not weight loss. Weight loss primarily depends on a caloric deficit, meaning consuming fewer calories than expended, regardless of the fat type.

Question 45: Approximately how many calories are in one pound of body fat?

2,000 calories
5,000 calories
3,500 calories (Correct answer)
1,000 calories

Correct answer: 3,500 calories

One pound of body fat contains approximately 3,500 calories, meaning a 500-calorie daily deficit leads to roughly one pound of fat loss per week.

Question 46: What is 'food volume eating' as a weight loss strategy?

Drinking large amounts of water before meals only
Consuming large portions of low-calorie-density foods to feel full (Correct answer)
Eating the same volume at every meal regardless of food type
Measuring food by volume instead of weight

Correct answer: Consuming large portions of low-calorie-density foods to feel full

Volumetric or volume eating involves filling meals with high-volume, low-calorie foods (vegetables, broth, fruit) to achieve satiety without excess calories.

Question 47: What is 'time-restricted eating' (TRE)?

Eating only before noon each day
Restricting eating to low-calorie times of day
Confining all daily food intake to a specific time window (Correct answer)
Limiting portion sizes at each meal

Correct answer: Confining all daily food intake to a specific time window

Time-restricted eating involves consuming all daily calories within a defined time window, typically 8–12 hours, aligned with the body's circadian rhythm.

Question 48: What is 'autophagy' and how does it relate to intermittent fasting?

A cellular self-cleaning process stimulated by fasting (Correct answer)
A digestive enzyme released during eating
A type of insulin response
A form of muscle anabolism triggered by eating

Correct answer: A cellular self-cleaning process stimulated by fasting

Autophagy is the body's cellular self-cleaning process where damaged proteins and organelles are recycled, and it is stimulated by fasting periods.

Question 49: Nuts are allowed on the South Beach Diet primarily because they provide what benefit?

High levels of simple carbohydrates for energy
Healthy unsaturated fats and protein that promote satiety (Correct answer)
High glycemic energy for workouts
Large amounts of fiber with zero fat

Correct answer: Healthy unsaturated fats and protein that promote satiety

Nuts supply healthy unsaturated fats, protein, and fiber that help keep you full and support heart health on the South Beach Diet.

Question 50: How does the South Beach Diet differ from the Atkins Diet?

South Beach eliminates protein while Atkins emphasizes it
Both diets are identical in their approach
South Beach permits unlimited saturated fat while Atkins restricts it
South Beach focuses on carb quality and heart-healthy fats; Atkins focuses mainly on very low carb intake regardless of fat type (Correct answer)

Correct answer: South Beach focuses on carb quality and heart-healthy fats; Atkins focuses mainly on very low carb intake regardless of fat type

South Beach emphasizes the quality of carbohydrates and healthy fats, whereas Atkins primarily focuses on very low carbohydrate intake without distinguishing fat types.

Question 51: What is 'food logging' and how does research support its effectiveness for weight loss?

Logging meals to share with a dietitian monthly
Recording meal timing without tracking calories
Tracking food intake in a journal or app, which research shows improves weight loss outcomes (Correct answer)
Photographing meals for social media

Correct answer: Tracking food intake in a journal or app, which research shows improves weight loss outcomes

Research shows that consistent food logging (tracking what you eat via app or journal) significantly improves weight loss outcomes by creating awareness of calorie intake.

Question 52: Which macronutrient plays the most important role in hormone production?

Protein
Fiber
Dietary fat (Correct answer)
Carbohydrates

Correct answer: Dietary fat

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

Question 53: Which dietary strategy is most associated with reducing delayed onset muscle soreness (DOMS)?

High sugar intake immediately post-workout
Adequate protein and anti-inflammatory foods like tart cherry juice (Correct answer)
Restricting all food for 4 hours post-exercise
Consuming only carbohydrates after training

Correct answer: Adequate protein and anti-inflammatory foods like tart cherry juice

Protein supports muscle repair and anti-inflammatory compounds in foods like tart cherry juice have been shown in studies to reduce DOMS severity.

Question 54: How does intermittent fasting affect growth hormone (HGH) levels?

HGH increases significantly during fasting (Correct answer)
HGH levels are unaffected by fasting
HGH decreases during fasting
HGH is converted to insulin during fasting

Correct answer: HGH increases significantly during fasting

Fasting has been shown to significantly increase growth hormone levels, which supports fat burning and muscle preservation.

Question 55: On the South Beach Diet, how is portion control typically handled?

Precise calorie counting of every meal is required
Portions are controlled by focusing on hunger cues and approved food categories rather than strict calorie limits (Correct answer)
Portions are determined by a daily point system
You can eat unlimited amounts of all approved foods

Correct answer: Portions are controlled by focusing on hunger cues and approved food categories rather than strict calorie limits

Rather than strict calorie counting, the South Beach Diet guides portion control through food quality choices and eating until satisfied — not stuffed.

Question 56: A whole-food plant-based diet (WFPB) emphasizes which types of foods?

Plant-based supplements and powders
Unprocessed or minimally processed plant foods like vegetables, fruits, legumes, and whole grains (Correct answer)
Processed vegan foods and plant-based meats
Raw foods only with no cooking

Correct answer: Unprocessed or minimally processed plant foods like vegetables, fruits, legumes, and whole grains

A whole-food plant-based diet emphasizes minimally processed plants — vegetables, fruits, whole grains, legumes, nuts, and seeds — over processed substitutes.

Question 57: Which fat type is considered the most harmful to cardiovascular health and is largely artificial?

Omega-3 fatty acid
Monounsaturated fat
Trans fat (Correct answer)
Polyunsaturated fat

Correct answer: Trans fat

Trans fats, especially industrial partially hydrogenated oils, raise LDL cholesterol and lower HDL, significantly increasing heart disease risk.

Question 58: What does research suggest about plant-based diets and the risk of type 2 diabetes?

Plant-based diets increase type 2 diabetes risk
Plant-based diets have no effect on diabetes risk
Plant-based diets are associated with significantly lower type 2 diabetes risk (Correct answer)
Only vegan diets (not plant-based) reduce diabetes risk

Correct answer: Plant-based diets are associated with significantly lower type 2 diabetes risk

Multiple large studies show that plant-based diets are associated with significantly lower risk of developing type 2 diabetes due to improved insulin sensitivity and weight management.

Question 59: What is the concept of 'protein complementarity' in plant-based nutrition?

Eating complete proteins at every meal separately
Combining different plant proteins to ensure all essential amino acids are obtained (Correct answer)
Eating protein supplements alongside plant foods
Avoiding plant proteins that compete with absorption

Correct answer: Combining different plant proteins to ensure all essential amino acids are obtained

Protein complementarity involves combining plant protein sources (like rice and beans) to provide all essential amino acids, though this doesn't need to happen at every single meal.

Question 60: What is the most common intermittent fasting protocol?

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

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 61: Which of the following best describes the South Beach Diet's approach to meal frequency?

Eat three meals plus planned snacks daily (Correct answer)
Skip breakfast to reduce calorie intake
Fast for 16 hours and eat within an 8-hour window
Eat one large meal per day

Correct answer: Eat three meals plus planned snacks daily

The South Beach Diet recommends three structured meals and planned snacks to keep blood sugar stable and prevent intense hunger.

Question 62: What stage of the South Beach Diet results in the greatest weight loss?

Phase Two
Phase Four
Phase One (Correct answer)
Phase Three

Correct answer: Phase One

Phase One of the South Beach Diet is designed to be the most restrictive, eliminating most carbohydrates and sugars to rapidly reduce cravings and initiate significant weight loss. This initial phase typically yields the quickest and most substantial weight reduction.

Question 63: After how many hours of fasting does the body typically begin significantly increasing fat oxidation?

2–4 hours
8–12 hours (Correct answer)
30–36 hours
20–24 hours

Correct answer: 8–12 hours

After approximately 8–12 hours of fasting, liver glycogen stores deplete and the body increasingly shifts to burning fat for energy.

Question 64: The Mediterranean diet encourages shared meals and social eating because of what broader principle?

It was originally designed for communal kitchens
Group eating improves digestion
It reduces portion sizes
Food culture and lifestyle are part of overall health (Correct answer)

Correct answer: Food culture and lifestyle are part of overall health

The Mediterranean diet emphasizes that food culture, lifestyle, social connections, and physical activity are all integral components of overall health and wellbeing.

Question 65: What is the recommended daily fiber intake for adult women under 50 according to US dietary guidelines?

38 grams
21 grams
25 grams (Correct answer)
15 grams

Correct answer: 25 grams

The recommended daily fiber intake for adult women under 50 is 25 grams per day.

Question 66: Sodium loss through sweat during prolonged exercise can lead to a condition called what?

Hypernatremia
Hyponatremia (Correct answer)
Hypertension
Hypoglycemia

Correct answer: Hyponatremia

Hyponatremia (low blood sodium) can result from heavy sweating combined with drinking large volumes of plain water without sodium replacement.

Question 67: What is 'heme iron' vs 'non-heme iron' relevant to plant-based diets?

Both types are equally absorbed regardless of source
Heme iron is from plants and is better absorbed; non-heme iron is from animals
Non-heme iron is from plants and is less readily absorbed than heme iron from animals (Correct answer)
Heme iron causes anemia; non-heme iron does not

Correct answer: Non-heme iron is from plants and is less readily absorbed than heme iron from animals

Non-heme iron from plant foods is less bioavailable than heme iron from animal foods; pairing plant iron with vitamin C can significantly improve absorption.

Question 68: What is the primary fuel source for moderate-intensity aerobic exercise lasting longer than 20 minutes?

Protein
Carbohydrates
Alcohol
Fat (Correct answer)

Correct answer: Fat

After the first 20 minutes of moderate aerobic exercise, fat becomes the dominant fuel source as glycogen stores deplete.

Question 69: The PREDIMED study demonstrated that the Mediterranean diet supplemented with olive oil or nuts reduced risk of major cardiovascular events by approximately how much?

30% (Correct answer)
5%
15%
50%

Correct answer: 30%

The PREDIMED trial showed a roughly 30% relative risk reduction in major cardiovascular events for participants on the Mediterranean diet with olive oil or nuts.

Question 70: True/False: Adding physical activity to your regular routine is a surefire method to lower your risk of heart disease.

True (Correct answer)
False

Correct answer: True

Regular physical activity significantly strengthens the heart, improves blood circulation, lowers blood pressure and cholesterol levels, and helps maintain a healthy weight. These combined effects are well-documented to substantially reduce the risk of developing heart disease.

Question 71: Which type of exercise is most effective for improving insulin sensitivity?

High-intensity sprinting only
Combined aerobic and resistance training (Correct answer)
Stretching and yoga only
Low-intensity walking under 15 minutes

Correct answer: Combined aerobic and resistance training

A combination of aerobic and resistance exercise produces the greatest improvements in insulin sensitivity by targeting multiple glucose-uptake pathways.

Question 72: Which of the following snacks best fits South Beach Diet Phase 1 guidelines?

Celery with almond butter (Correct answer)
A handful of pretzels
Crackers and cheese spread
A banana with honey

Correct answer: Celery with almond butter

Celery (non-starchy vegetable) with almond butter (healthy fats and protein) is ideal for Phase 1, avoiding refined carbs and sugar.

Question 73: True/False: Time constraints and a lack of enjoyment are often the biggest obstacles to exercising.

False
True (Correct answer)

Correct answer: True

Many individuals cite busy schedules and the perception of not having enough time as major barriers to regular exercise. Additionally, if exercise is not enjoyable, it becomes difficult to sustain, leading to a lack of motivation and adherence.

Question 74: Which macronutrient is the body's preferred primary source of energy?

Fiber
Carbohydrates (Correct answer)
Protein
Fat

Correct answer: Carbohydrates

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

Question 75: Which vitamin is particularly important to supplement on a plant-based diet due to limited sun exposure and lack of dietary sources?

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

Correct answer: Vitamin D

Vitamin D is limited in plant foods and many people, especially those indoors, are deficient; supplementation or fortified foods are important on a plant-based diet.

Question 76: Which macronutrient has the highest thermic effect of food (TEF)?

Alcohol
Fat
Protein (Correct answer)
Carbohydrates

Correct answer: Protein

Protein has the highest thermic effect, requiring 20–30% of its caloric value just for digestion and metabolism.

Question 77: Which dietary pattern best supports fat loss while preserving muscle during a calorie deficit?

Low calorie with minimal protein
Strict fasting with no post-workout nutrition
Very low protein, high carbohydrate
High protein intake combined with resistance training (Correct answer)

Correct answer: High protein intake combined with resistance training

Adequate protein intake (1.6–2.2 g/kg body weight) combined with resistance training preserves muscle mass during a caloric deficit.

Question 78: Which of the following sweeteners is generally considered keto-friendly?

Table sugar
High-fructose corn syrup
Honey
Stevia (Correct answer)

Correct answer: Stevia

Stevia is a zero-calorie, zero-carb natural sweetener that does not raise blood sugar and is considered keto-friendly.

Question 79: Relative Energy Deficiency in Sport (RED-S) is most commonly triggered by which scenario?

Taking creatine supplements
Overhydration during competition
Eating too much protein
Chronic low energy availability relative to training demands (Correct answer)

Correct answer: Chronic low energy availability relative to training demands

RED-S occurs when athletes do not consume enough calories to support both exercise and normal physiological functions, affecting hormones, bone, and immunity.

Question 80: What is the glycemic index (GI) used to measure?

Total calorie content of a food
Fat content relative to carbohydrates
How quickly a food raises blood sugar levels (Correct answer)
The amount of sugar in a food

Correct answer: How quickly a food raises blood sugar levels

The glycemic index ranks foods on a scale of 0-100 based on how quickly they raise blood glucose levels after eating.

Question 81: What role does sleep play in weight loss and appetite regulation?

Poor sleep increases ghrelin (hunger hormone) and decreases leptin (satiety hormone), promoting overeating (Correct answer)
Sleep has no effect on hunger or weight
Sleep only affects energy levels, not food choices
More sleep directly burns fat

Correct answer: Poor sleep increases ghrelin (hunger hormone) and decreases leptin (satiety hormone), promoting overeating

Insufficient sleep disrupts hunger hormones by raising ghrelin and lowering leptin, leading to increased appetite and cravings, especially for high-calorie foods.

Question 82: Who was the South Beach Diet's creator?

Dr. Angelo
Dr. Beach
Dr. Russo
Dr. Agatston (Correct answer)

Correct answer: Dr. Agatston

The South Beach Diet was created by Dr. Arthur Agatston, a cardiologist, who developed it to help his patients lose weight and improve their heart health by focusing on lean protein, healthy fats, and good carbohydrates.

Question 83: What is the recommended carbohydrate intake per hour for endurance events lasting more than 2.5 hours?

30–60 g/hr
60–90 g/hr (Correct answer)
10–20 g/hr
100–120 g/hr

Correct answer: 60–90 g/hr

Research supports 60–90 g of carbohydrates per hour (using multiple transportable carbs) for events exceeding 2.5 hours to sustain performance.

Question 84: Which macronutrient has the highest thermic effect of food (TEF), meaning the body burns the most calories digesting it?

Protein (Correct answer)
Fat
Carbohydrates
Alcohol

Correct answer: Protein

Protein has a TEF of approximately 20–35%, compared to 5–15% for carbohydrates and 0–3% for fat, making it the most metabolically costly macronutrient to digest.

Question 85: Which vitamin is uniquely found in animal foods and not naturally present in plant foods?

Folate
Vitamin C
Vitamin K
Vitamin B12 (Correct answer)

Correct answer: Vitamin B12

Vitamin B12 is naturally found only in animal-derived foods, making supplementation important for vegans.

Question 86: For a person trying to lose weight, which statement about exercise and appetite is most supported by research?

Strength training always increases appetite more than cardio
Exercise has zero effect on appetite hormones
Exercise always suppresses appetite, making weight loss easy
High-intensity exercise may temporarily suppress appetite, but compensation eating often offsets calories burned (Correct answer)

Correct answer: High-intensity exercise may temporarily suppress appetite, but compensation eating often offsets calories burned

Research shows that many people unconsciously compensate for exercise calories through increased food intake or reduced non-exercise activity, blunting expected weight loss.

Question 87: Which nutrient is most commonly deficient in people following a strict plant-based diet?

Vitamin C
Magnesium
Potassium
Vitamin B12 (Correct answer)

Correct answer: Vitamin B12

Vitamin B12 is found almost exclusively in animal products, making supplementation essential for those following a strict plant-based diet.

Question 88: What does the term 'net carbs' mean in the context of the keto diet?

Total carbs minus fat
Carbs absorbed per hour
Total calories from carbs
Total carbs minus fiber and sugar alcohols (Correct answer)

Correct answer: Total carbs minus fiber and sugar alcohols

Net carbs are calculated by subtracting fiber and sugar alcohols from total carbohydrates, as these minimally impact blood sugar.

Question 89: A person on the South Beach Diet is dining at a restaurant. Which entrée choice best aligns with Phase 2 guidelines?

Fried shrimp with white rice
Grilled chicken over mixed greens with olive oil dressing and a side of brown rice (Correct answer)
Pasta primavera with white pasta
Cheeseburger on a brioche bun

Correct answer: Grilled chicken over mixed greens with olive oil dressing and a side of brown rice

Grilled chicken, mixed greens, olive oil dressing, and brown rice represent lean protein, healthy fats, non-starchy vegetables, and a low-glycemic whole grain — all Phase 2 compatible.

Question 90: Which of the following is a high-fat, keto-friendly food?

Olive oil (Correct answer)
Sweet potato
Oatmeal
Brown rice

Correct answer: Olive oil

Olive oil is nearly 100% fat with zero carbohydrates, making it an ideal staple for a ketogenic diet.

Question 91: Which macronutrient is most satiating per calorie and helps preserve muscle during weight loss?

Protein (Correct answer)
Fiber
Carbohydrates
Fat

Correct answer: Protein

Protein is the most satiating macronutrient per calorie and is essential for preserving lean muscle mass during a calorie deficit.

Question 92: What role do B vitamins play in exercise performance?

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

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 93: What role does physical activity play in the Mediterranean diet lifestyle?

It is discouraged to preserve energy
It is a core component alongside dietary habits (Correct answer)
It is recommended only for weight loss
It is unrelated to the diet

Correct answer: It is a core component alongside dietary habits

Regular physical activity — including walking and outdoor activities — is a core component of the Mediterranean lifestyle, complementing dietary habits.

Question 94: Dairy consumption in the Mediterranean diet is mainly in what form?

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

Correct answer: Yogurt and cheese

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

Question 95: What is the primary benefit of aligning eating windows with earlier times of day?

It increases protein absorption
It prevents nighttime hunger
It allows for larger meals
It aligns with circadian rhythms for better metabolic health (Correct answer)

Correct answer: It aligns with circadian rhythms for better metabolic health

Early time-restricted eating that aligns with daylight hours supports the body's circadian rhythm, improving insulin sensitivity and metabolic health.

Question 96: How often does the Mediterranean diet recommend eating red meat?

Daily
Rarely or a few times per month (Correct answer)
Never
Several times per week

Correct answer: Rarely or a few times per month

The Mediterranean diet recommends limiting red meat to a few times per month, emphasizing fish, poultry, and plant proteins instead.

Question 97: Does intermittent fasting significantly slow metabolism compared to continuous calorie restriction?

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

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 98: Which of the following foods is NOT typically allowed on a ketogenic diet?

Bacon
Avocado
Cheese
White bread (Correct answer)

Correct answer: White bread

White bread is high in carbohydrates and is not allowed on a ketogenic diet, which restricts carbs to about 20–50g per day.

Question 99: What is the recommended minimum protein intake per pound of body weight to preserve muscle mass during weight loss?

0.7–1.0 grams per pound (Correct answer)
0.4 grams per pound
1.5–2.0 grams per pound
0.2 grams per pound

Correct answer: 0.7–1.0 grams per pound

Most research supports consuming 0.7–1.0 grams of protein per pound of body weight during a calorie deficit to minimize muscle loss.

Question 100: What is a key reason the South Beach Diet restricts high-glycemic foods?

They cause rapid blood sugar spikes followed by crashes and cravings (Correct answer)
They contain too much protein
They increase fiber intake too quickly
They interfere with vitamin absorption

Correct answer: They cause rapid blood sugar spikes followed by crashes and cravings

High-glycemic foods cause rapid blood sugar spikes and subsequent crashes, triggering hunger and cravings that derail weight loss.

Question 101: Which form of omega-3 fatty acid found primarily in fatty fish has the most direct anti-inflammatory benefit for exercising muscles?

EPA and DHA (Correct answer)
GLA (gamma-linolenic acid)
ALA (alpha-linolenic acid)
LA (linoleic acid)

Correct answer: EPA and DHA

EPA and DHA from marine sources are long-chain omega-3s that directly reduce exercise-induced inflammation and may support muscle protein synthesis.

Question 102: Which herb and spice practice is a defining feature of Mediterranean cooking?

Regular use of MSG
Liberal use of herbs and spices to flavor food (Correct answer)
Heavy use of salt for seasoning
Reliance on sugar for balance

Correct answer: Liberal use of herbs and spices to flavor food

Mediterranean cooking relies heavily on herbs (basil, oregano, rosemary) and spices to flavor food, reducing the need for excess salt or sugar.

Question 103: True or False: You should spread out your meals throughout the day rather than skipping a meal to cut calories.

False
True (Correct answer)

Correct answer: True

Spreading meals throughout the day can help maintain stable blood sugar levels, prevent extreme hunger, and reduce the likelihood of overeating later. Skipping meals often leads to increased hunger and compensatory overeating, which can hinder calorie control and make healthy eating more challenging.

Question 104: Which food group provides the most complete source of all essential amino acids?

Animal proteins (Correct answer)
Grains
Legumes
Nuts

Correct answer: Animal proteins

Animal proteins such as meat, eggs, and dairy contain all essential amino acids in adequate proportions, making them complete proteins.

Question 105: Which mineral is most critical for oxygen transport in the blood and directly impacts exercise endurance?

Iron (Correct answer)
Magnesium
Calcium
Zinc

Correct answer: Iron

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

Question 106: Which hormone's sensitivity improves with intermittent fasting?

Cortisol
Thyroid hormone
Testosterone
Insulin (Correct answer)

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 107: What is 'Eat Stop Eat' as an intermittent fasting protocol?

Eating one meal per day
Alternating between eating and fasting every other day
Fasting for 24 hours once or twice per week (Correct answer)
Fasting for 12 hours daily

Correct answer: Fasting for 24 hours once or twice per week

Eat Stop Eat involves doing one or two 24-hour fasts per week, with normal eating on the non-fasting days.

Question 108: The Mediterranean diet has been shown to reduce the risk of which condition?

Cardiovascular disease (Correct answer)
Osteoporosis
Hypoglycemia
Hypothyroidism

Correct answer: Cardiovascular disease

Numerous large studies, including the PREDIMED trial, have shown the Mediterranean diet significantly reduces the risk of cardiovascular disease.

Question 109: What side effect is commonly reported when beginning intermittent fasting?

Rapid muscle gain
Hunger and irritability during the initial adaptation period (Correct answer)
Increased energy immediately
Improved sleep from day one

Correct answer: Hunger and irritability during the initial adaptation period

Hunger and irritability ('hanger') are common during the first 1–2 weeks of intermittent fasting as the body adapts to new eating patterns.

Question 110: In the list below, which item is NOT a dairy product?

Yogurt
Fromage frais
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 111: Which scientific term describes the shift from glucose to fat burning that occurs during fasting?

Metabolic flexibility (Correct answer)
Anabolic switching
Lipid catabolism
Gluconeogenesis only

Correct answer: Metabolic flexibility

Metabolic flexibility refers to the body's ability to switch fuel sources between glucose and fat depending on availability, which improves with regular fasting.

Question 112: A vegetarian who eats dairy and eggs but no meat is classified as which type?

Lacto-ovo vegetarian (Correct answer)
Vegan
Pescatarian
Flexitarian

Correct answer: Lacto-ovo vegetarian

A lacto-ovo vegetarian avoids meat and fish but includes dairy products (lacto) and eggs (ovo) in their diet.

Question 113: Which protein source would be most consistent with South Beach Diet Phase 1 guidelines?

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

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 114: Saturated fats are generally found in greatest quantities in which type of food?

Almonds
Salmon
Fatty beef (Correct answer)
Olive oil

Correct answer: Fatty beef

Fatty beef is high in saturated fat, which is predominantly found in animal products, particularly red meat and full-fat dairy.

Question 115: Which type of carbohydrate is digested most slowly and helps regulate blood sugar?

Simple sugars
Complex carbohydrates (Correct answer)
Refined grains
High-fructose corn syrup

Correct answer: Complex carbohydrates

Complex carbohydrates contain long chains of glucose that digest slowly, providing sustained energy and stabilizing blood sugar.

Question 116: Which blood marker is often tested to confirm the body is in nutritional ketosis?

LDL cholesterol
C-reactive protein
Beta-hydroxybutyrate (Correct answer)
Hemoglobin A1c

Correct answer: Beta-hydroxybutyrate

Beta-hydroxybutyrate (BHB) is the primary ketone body in the blood and is measured to confirm nutritional ketosis, typically above 0.5 mmol/L.

Question 117: What distinguishes a plant-based diet from a vegan diet?

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
There is no difference between them

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 118: Which type of fat is emphasized as 'good' and encouraged on the South Beach Diet?

Trans fat from processed foods
Unsaturated fat from olive oil and nuts (Correct answer)
Hydrogenated vegetable shortening
Saturated fat from red meat

Correct answer: Unsaturated fat from olive oil and nuts

The South Beach Diet encourages unsaturated fats from sources like olive oil, avocado, and nuts while limiting saturated and trans fats.

Question 119: Which zinc-rich plant food is commonly recommended for plant-based eaters?

Tomatoes
Pumpkin seeds (Correct answer)
White bread
Romaine lettuce

Correct answer: Pumpkin seeds

Pumpkin seeds are among the richest plant-based sources of zinc, an essential mineral less bioavailable from plant foods than from animal products.

Question 120: Which statement about alcohol on the South Beach Diet is accurate?

Beer is the preferred alcoholic beverage on all phases
Alcohol has no impact on the diet's results
All alcohol is freely permitted in Phase 1
Moderate consumption of dry wine may be allowed starting in Phase 2 (Correct answer)

Correct answer: Moderate consumption of dry wine may be allowed starting in Phase 2

Alcohol is restricted in Phase 1, but moderate amounts of dry wine may be reintroduced in Phase 2 since it has a lower sugar content than most other alcoholic beverages.

Question 121: What is the approximate caloric split (carbs/fat/protein) suggested by the USDA Dietary Guidelines for a balanced diet?

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

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 122: What is the primary fuel source for the brain on a well-established ketogenic diet?

Ketone bodies (Correct answer)
Glycogen
Protein
Glucose

Correct answer: Ketone bodies

After adaptation, the brain can meet up to 70% of its energy needs from ketone bodies instead of glucose.

Question 123: What term describes the daily minimum amount of a nutrient needed to prevent deficiency in healthy individuals?

Estimated Average Requirement (EAR)
Adequate Intake (AI)
Recommended Dietary Allowance (RDA) (Correct answer)
Tolerable Upper Intake Level (UL)

Correct answer: Recommended Dietary Allowance (RDA)

The RDA is the daily intake level sufficient to meet the needs of nearly all healthy individuals in a specific group.

Question 124: Which of the following is classified as a complete protein?

Lentils
Black beans
Chicken breast (Correct answer)
Brown rice

Correct answer: Chicken breast

Chicken breast is a complete protein because it contains all nine essential amino acids in adequate amounts.

Question 125: What is the typical daily carbohydrate limit to maintain ketosis?

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

Correct answer: 20–50 grams

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

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.

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40 min

Time Limit

70%

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