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WGU D440 HESI NUTRITION EXAM
2026/2027
Exact Official Count: 75 Questions
Complete Exam-Style Questions with Detailed Rationales
100% Verified | Graded A+
Western Governors University
D440: Health and Wellness Through Nutritional Science
Comprehensive Nutritional Science Competency Assessment
for Nursing Students
75 MCQ Questions | 90 Minutes | Computer-Based Assessment
Per WGU D440 HESI Nutrition Specifications | Academy of Nutrition and Dietetics Standards
Core Domains
Macronutrients & Micronutrients (20%)
Digestion & Metabolism (16%)
Life Cycle Nutrition (17%)
Dietary Guidelines & MyPlate (13%)
Nutrition Assessment & Counseling (13%)
Food Safety & Security (11%)
Chronic Disease Prevention & Scenario Application (10%)
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Examination Overview
Domain Questions Key Topics Weight
Macronutrients & 15 Carbohydrates/Proteins/Fats 20%
Micronutrients Functions, Essential Amino/Fatty
Acids, Vitamins/Minerals, Water
Balance, RDA/AI/UL
Digestion & 12 GI Tract Physiology, Enzyme 16%
Metabolism Function, Nutrient Absorption,
Energy Metabolism, Basal Metabolic
Rate
Life Cycle Nutrition 13 Pregnancy/Lactation, 17%
Infant/Child/Adolescent Needs,
Adult/Aging Nutrition, Special
Populations
Dietary Guidelines & 10 DGA 2020-2025, MyPlate 13%
MyPlate Components, Portion Sizes, Healthy
Eating Patterns, Cultural
Adaptations
Nutrition 10 Anthropometrics, Biochemical Data, 13%
Assessment & Dietary Intake Assessment,
Counseling Motivational Interviewing, Goal
Setting
Food Safety & 8 Foodborne Illness Prevention, Safe 11%
Security Food Handling, Food Deserts,
SNAP/WIC Programs, Community
Resources
Chronic Disease 7 Nutrition in 10%
Prevention & Diabetes/CVD/Osteoporosis/Cancer,
Scenario Application Therapeutic Diets, Multi-Domain
Integration
Domain: Macronutrients & Micronutrients
1. Which macronutrient provides the most concentrated source of energy per gram?
A. Carbohydrates (4 kcal/g)
B. Proteins (4 kcal/g)
C. Fats (9 kcal/g)
D. Alcohol (7 kcal/g)
Correct Answer: C
Rationale: Fats provide 9 kcal per gram, making them the most energy-dense macronutrient.
Carbohydrates and proteins each provide 4 kcal/g. Alcohol provides 7 kcal/g but is not classified as
an essential nutrient. Understanding energy density is fundamental to nutrition counseling for
weight management, therapeutic diets, and patient education about balanced intake.
2. A patient asks about the difference between water-soluble and fat-soluble vitamins.
Which statement accurately describes fat-soluble vitamins?
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A. They are excreted readily in urine and require daily intake
B. They include vitamins C and all B-complex vitamins
C. They are stored in the liver and adipose tissue, with potential for toxicity if consumed in excess
D. They are not affected by dietary fat intake
Correct Answer: C
Rationale: Fat-soluble vitamins (A, D, E, K) are stored in the liver and adipose tissue, which means
they do not require daily intake but carry risk of toxicity with excessive supplementation. Water-
soluble vitamins (B-complex and C) are excreted in urine and require regular intake. Fat-soluble
vitamin absorption is enhanced by dietary fat. Understanding these differences guides safe
supplementation counseling and recognition of deficiency/toxicity patterns.
3. Select All That Apply: Which of the following are essential amino acids that must be
obtained from the diet? (Select All That Apply)
A. Leucine
B. Lysine
C. Alanine
D. Tryptophan
Correct Answer: A, B, D
Rationale: Essential amino acids cannot be synthesized by the human body and must be obtained
from dietary protein sources. Leucine (A), lysine (B), and tryptophan (D) are essential amino acids.
Alanine (C) is non-essential because the body can synthesize it. There are nine essential amino acids
total. Understanding essential vs. non-essential amino acids is important for counseling patients
on complete protein sources, especially those following plant-based diets.
4. Which type of dietary fat is generally considered most beneficial for cardiovascular
health when substituted for saturated fat?
A. Trans fats
B. Monounsaturated fats
C. Saturated fats
D. Partially hydrogenated oils
Correct Answer: B
Rationale: Monounsaturated fats (found in olive oil, avocados, nuts) are associated with improved
cardiovascular outcomes when they replace saturated fats in the diet. Trans fats (A) and partially
hydrogenated oils (D) increase cardiovascular risk and should be avoided. Saturated fats (C)
should be limited per Dietary Guidelines. Evidence-based nutrition counseling emphasizes
replacing saturated fats with unsaturated fats for heart health.
5. What is the primary function of dietary fiber?
A. Providing a concentrated source of energy (9 kcal/g)
B. Promoting regular bowel movements, supporting gut health, and helping regulate blood glucose
and cholesterol
C. Building and repairing body tissues
D. Serving as the body's preferred energy source during high-intensity exercise
Correct Answer: B
Rationale: Dietary fiber promotes regular bowel movements, supports beneficial gut microbiota,
helps regulate blood glucose by slowing carbohydrate absorption, and assists in lowering
cholesterol through bile acid binding. Fiber is not a significant energy source (A is incorrect—fiber
provides approximately 2 kcal/g via fermentation, not 9). Building tissues (C) is protein's role.
Carbohydrates, not fiber, are the preferred energy source during high-intensity exercise (D).
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WGU D440 HESI NUTRITION EXAM
2026/2027
Exact Official Count: 75 Questions
Complete Exam-Style Questions with Detailed Rationales
100% Verified | Graded A+
Western Governors University
D440: Health and Wellness Through Nutritional Science
Comprehensive Nutritional Science Competency Assessment
for Nursing Students
75 MCQ Questions | 90 Minutes | Computer-Based Assessment
Per WGU D440 HESI Nutrition Specifications | Academy of Nutrition and Dietetics Standards
Core Domains
Macronutrients & Micronutrients (20%)
Digestion & Metabolism (16%)
Life Cycle Nutrition (17%)
Dietary Guidelines & MyPlate (13%)
Nutrition Assessment & Counseling (13%)
Food Safety & Security (11%)
Chronic Disease Prevention & Scenario Application (10%)
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Examination Overview
Domain Questions Key Topics Weight
Macronutrients & 15 Carbohydrates/Proteins/Fats 20%
Micronutrients Functions, Essential Amino/Fatty
Acids, Vitamins/Minerals, Water
Balance, RDA/AI/UL
Digestion & 12 GI Tract Physiology, Enzyme 16%
Metabolism Function, Nutrient Absorption,
Energy Metabolism, Basal Metabolic
Rate
Life Cycle Nutrition 13 Pregnancy/Lactation, 17%
Infant/Child/Adolescent Needs,
Adult/Aging Nutrition, Special
Populations
Dietary Guidelines & 10 DGA 2020-2025, MyPlate 13%
MyPlate Components, Portion Sizes, Healthy
Eating Patterns, Cultural
Adaptations
Nutrition 10 Anthropometrics, Biochemical Data, 13%
Assessment & Dietary Intake Assessment,
Counseling Motivational Interviewing, Goal
Setting
Food Safety & 8 Foodborne Illness Prevention, Safe 11%
Security Food Handling, Food Deserts,
SNAP/WIC Programs, Community
Resources
Chronic Disease 7 Nutrition in 10%
Prevention & Diabetes/CVD/Osteoporosis/Cancer,
Scenario Application Therapeutic Diets, Multi-Domain
Integration
Domain: Macronutrients & Micronutrients
1. Which macronutrient provides the most concentrated source of energy per gram?
A. Carbohydrates (4 kcal/g)
B. Proteins (4 kcal/g)
C. Fats (9 kcal/g)
D. Alcohol (7 kcal/g)
Correct Answer: C
Rationale: Fats provide 9 kcal per gram, making them the most energy-dense macronutrient.
Carbohydrates and proteins each provide 4 kcal/g. Alcohol provides 7 kcal/g but is not classified as
an essential nutrient. Understanding energy density is fundamental to nutrition counseling for
weight management, therapeutic diets, and patient education about balanced intake.
2. A patient asks about the difference between water-soluble and fat-soluble vitamins.
Which statement accurately describes fat-soluble vitamins?
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A. They are excreted readily in urine and require daily intake
B. They include vitamins C and all B-complex vitamins
C. They are stored in the liver and adipose tissue, with potential for toxicity if consumed in excess
D. They are not affected by dietary fat intake
Correct Answer: C
Rationale: Fat-soluble vitamins (A, D, E, K) are stored in the liver and adipose tissue, which means
they do not require daily intake but carry risk of toxicity with excessive supplementation. Water-
soluble vitamins (B-complex and C) are excreted in urine and require regular intake. Fat-soluble
vitamin absorption is enhanced by dietary fat. Understanding these differences guides safe
supplementation counseling and recognition of deficiency/toxicity patterns.
3. Select All That Apply: Which of the following are essential amino acids that must be
obtained from the diet? (Select All That Apply)
A. Leucine
B. Lysine
C. Alanine
D. Tryptophan
Correct Answer: A, B, D
Rationale: Essential amino acids cannot be synthesized by the human body and must be obtained
from dietary protein sources. Leucine (A), lysine (B), and tryptophan (D) are essential amino acids.
Alanine (C) is non-essential because the body can synthesize it. There are nine essential amino acids
total. Understanding essential vs. non-essential amino acids is important for counseling patients
on complete protein sources, especially those following plant-based diets.
4. Which type of dietary fat is generally considered most beneficial for cardiovascular
health when substituted for saturated fat?
A. Trans fats
B. Monounsaturated fats
C. Saturated fats
D. Partially hydrogenated oils
Correct Answer: B
Rationale: Monounsaturated fats (found in olive oil, avocados, nuts) are associated with improved
cardiovascular outcomes when they replace saturated fats in the diet. Trans fats (A) and partially
hydrogenated oils (D) increase cardiovascular risk and should be avoided. Saturated fats (C)
should be limited per Dietary Guidelines. Evidence-based nutrition counseling emphasizes
replacing saturated fats with unsaturated fats for heart health.
5. What is the primary function of dietary fiber?
A. Providing a concentrated source of energy (9 kcal/g)
B. Promoting regular bowel movements, supporting gut health, and helping regulate blood glucose
and cholesterol
C. Building and repairing body tissues
D. Serving as the body's preferred energy source during high-intensity exercise
Correct Answer: B
Rationale: Dietary fiber promotes regular bowel movements, supports beneficial gut microbiota,
helps regulate blood glucose by slowing carbohydrate absorption, and assists in lowering
cholesterol through bile acid binding. Fiber is not a significant energy source (A is incorrect—fiber
provides approximately 2 kcal/g via fermentation, not 9). Building tissues (C) is protein's role.
Carbohydrates, not fiber, are the preferred energy source during high-intensity exercise (D).
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