WGU D440 HEALTH AND
WELLNESS THROUGH
NUTRITIONAL SCIENCE |
LATEST MOCK PRACTICE SET
199 Questions with Answers and Detailed Rationales
100 PERCENT GUARANTEED PASS
INSTANT DOWNLOAD ANSWERS INCLUDED
IMPORTANCE OF THIS DOCUMENT
This comprehensive examination preparation guide has been meticulously developed to help you succeed in the
WGU D440 HEALTH AND WELLNESS THROUGH NUTRITIONAL SCIENCE | OBJECTIVE ASSESSMENT | OA
V1 AND V2 | QUESTIONS AND ANSWERS | 2026 UPDATE. It contains 199 carefully selected questions that
reflect the most current exam content and testing strategies. Each question is accompanied by a correct answer
and a detailed rationale that explains the underlying pathophysiology, pharmacology, or clinical reasoning.
Self-Assessment – Test your knowledge and Exam Preparation – Familiarize yourself with the
identify areas requiring further question format and content
study areas
Concept Reinforcement – Deepen your Confidence Building – Develop test-taking
understanding through strategies and reduce
evidence-based exam anxiety
rationales
Time Management – Practice answering
questions under simulated
exam conditions
Review Summary 199 Questions
Foundations - Application - WGU D440 Health AND Wellness Through Nutritional Science Objective
Assessment OA V1 AND V2 AND 2026 Update Nutritional Science Health AND Wellness Undergraduate
YEAR 3 / Graduate
All answers with rationales
,Table of Contents
Content Area Questions Key Topics
Nutritional Assessment AND 1-34 Dietary, Metabolic, Explains, Disease, Mechanism
Diagnosis
Macronutrients 35-68 Dietary, Intake, Disease, Glycemic, Explains
Carbohydrates Proteins AND
Lipids
Micronutrients Vitamins AND 69-102 Dietary, Effect, Likely, Appropriate, Study
Minerals
Digestion Absorption AND 103-136 Dietary, Metabolic, Explains, Disease, Intake
Metabolism
Nutrition Across THE 137-170 Dietary, Disease, Intervention, Intake, Study
Lifespan
Nutritional Therapy FOR 171-199 Dietary, Likely, Intake, Metabolic, Combination
Chronic Diseases
TOTAL 199 All questions include answers and detailed rationales
,Section A - Nutritional Assessment AND Diagnosis
Q1.
In a controlled trial, participants following a high-protein ketogenic diet show elevated
plasma -hydroxybutyrate and reduced respiratory quotient. Which metabolic adaptation
most directly explains the shift in fuel utilization?
A. Upregulation of pyruvate dehydrogenase B. Increased insulin secretion promoting
kinase (PDK) leading to decreased pyruvate glucose uptake and glycolysis
dehydrogenase activity
C. Activation of acetyl-CoA carboxylase, D. Suppression of hormone-sensitive lipase,
increasing malonyl-CoA and fatty acid reducing adipose tissue lipolysis
synthesis
Correct: A - Upregulation of pyruvate dehydrogenase kinase (PDK) leading to decreased
pyruvate dehydrogenase activity
Rationale:In ketosis, PDK is upregulated, phosphorylating and inhibiting pyruvate
dehydrogenase, which reduces glucose oxidation and conserves oxaloacetate for
gluconeogenesis. Option B is opposite; insulin is typically low. Option C promotes fatty acid
synthesis, not oxidation. Option D would reduce lipolysis, contrary to ketogenic state.
Q2.
A researcher uses the Mifflin-St Jeor equation to estimate resting metabolic rate (RMR) in
a group of adults. Which scenario would most likely lead to a significant underestimation
of measured RMR?
A. Individuals with high lean body mass B. Individuals with obesity and low physical
activity
C. Older adults with sarcopenia D. Sedentary individuals with normal BMI
Correct: A - Individuals with high lean body mass
Rationale:Mifflin-St Jeor is less accurate in highly muscular individuals because it relies on
weight and height, not body composition. High lean mass increases actual RMR, leading to
underestimation. Obesity, sarcopenia, and sedentary normal-weight individuals have lower or
average lean mass, making underestimation less likely.
Q3.
In the context of the Dietary Guidelines for Americans 2020-2025, which of the following
dietary patterns would be most likely to meet the recommended limits for added sugars
and saturated fats while providing adequate potassium and fiber?
Page 3
, Section A - Nutritional Assessment AND Diagnosis
A. A vegan diet emphasizing refined grains B. A Mediterranean-style diet with moderate
and fruit juices fish and olive oil
C. A low-carbohydrate diet high in red meat D. A typical Western diet with fortified
and butter cereals
Correct: B - A Mediterranean-style diet with moderate fish and olive oil
Rationale:The Mediterranean pattern aligns with DGA recommendations: low in added
sugars and saturated fat, high in fiber and potassium from plant foods. Vegan with refined
grains/juices is high in added sugar and low in potassium. Low-carb with red meat/butter is
high in saturated fat. Western diet is high in added sugars and sodium.
Q4.
During the first trimester of pregnancy, a woman's energy needs increase minimally.
However, her need for which nutrient increases substantially due to its role in neural tube
development?
A. Iron B. Folate
C. Calcium D. Vitamin B12
Correct: B - Folate
Rationale:Folate requirements increase by about 50% in pregnancy to support rapid cell
division and neural tube closure, which occurs in the first 28 days post-conception. Iron needs
increase later due to expanded blood volume. Calcium needs do not increase during
pregnancy (absorption increases). B12 needs increase but not as dramatically as folate.
Q5.
A patient with chronic kidney disease (CKD) has hyperkalemia. Which dietary modification
is most appropriate to address this electrolyte imbalance?
A. Increasing intake of bananas and B. Restricting high-potassium foods such as
oranges potatoes and tomatoes
C. Supplementing with potassium chloride D. Encouraging a high-protein diet to
salt substitutes improve renal function
Correct: B - Restricting high-potassium foods such as potatoes and tomatoes
Rationale:Hyperkalemia in CKD requires limiting dietary potassium. Bananas, oranges,
potatoes, and tomatoes are high-potassium. Salt substitutes contain potassium chloride and
should be avoided. High-protein diets can increase renal workload and potassium load.
Page 4
WELLNESS THROUGH
NUTRITIONAL SCIENCE |
LATEST MOCK PRACTICE SET
199 Questions with Answers and Detailed Rationales
100 PERCENT GUARANTEED PASS
INSTANT DOWNLOAD ANSWERS INCLUDED
IMPORTANCE OF THIS DOCUMENT
This comprehensive examination preparation guide has been meticulously developed to help you succeed in the
WGU D440 HEALTH AND WELLNESS THROUGH NUTRITIONAL SCIENCE | OBJECTIVE ASSESSMENT | OA
V1 AND V2 | QUESTIONS AND ANSWERS | 2026 UPDATE. It contains 199 carefully selected questions that
reflect the most current exam content and testing strategies. Each question is accompanied by a correct answer
and a detailed rationale that explains the underlying pathophysiology, pharmacology, or clinical reasoning.
Self-Assessment – Test your knowledge and Exam Preparation – Familiarize yourself with the
identify areas requiring further question format and content
study areas
Concept Reinforcement – Deepen your Confidence Building – Develop test-taking
understanding through strategies and reduce
evidence-based exam anxiety
rationales
Time Management – Practice answering
questions under simulated
exam conditions
Review Summary 199 Questions
Foundations - Application - WGU D440 Health AND Wellness Through Nutritional Science Objective
Assessment OA V1 AND V2 AND 2026 Update Nutritional Science Health AND Wellness Undergraduate
YEAR 3 / Graduate
All answers with rationales
,Table of Contents
Content Area Questions Key Topics
Nutritional Assessment AND 1-34 Dietary, Metabolic, Explains, Disease, Mechanism
Diagnosis
Macronutrients 35-68 Dietary, Intake, Disease, Glycemic, Explains
Carbohydrates Proteins AND
Lipids
Micronutrients Vitamins AND 69-102 Dietary, Effect, Likely, Appropriate, Study
Minerals
Digestion Absorption AND 103-136 Dietary, Metabolic, Explains, Disease, Intake
Metabolism
Nutrition Across THE 137-170 Dietary, Disease, Intervention, Intake, Study
Lifespan
Nutritional Therapy FOR 171-199 Dietary, Likely, Intake, Metabolic, Combination
Chronic Diseases
TOTAL 199 All questions include answers and detailed rationales
,Section A - Nutritional Assessment AND Diagnosis
Q1.
In a controlled trial, participants following a high-protein ketogenic diet show elevated
plasma -hydroxybutyrate and reduced respiratory quotient. Which metabolic adaptation
most directly explains the shift in fuel utilization?
A. Upregulation of pyruvate dehydrogenase B. Increased insulin secretion promoting
kinase (PDK) leading to decreased pyruvate glucose uptake and glycolysis
dehydrogenase activity
C. Activation of acetyl-CoA carboxylase, D. Suppression of hormone-sensitive lipase,
increasing malonyl-CoA and fatty acid reducing adipose tissue lipolysis
synthesis
Correct: A - Upregulation of pyruvate dehydrogenase kinase (PDK) leading to decreased
pyruvate dehydrogenase activity
Rationale:In ketosis, PDK is upregulated, phosphorylating and inhibiting pyruvate
dehydrogenase, which reduces glucose oxidation and conserves oxaloacetate for
gluconeogenesis. Option B is opposite; insulin is typically low. Option C promotes fatty acid
synthesis, not oxidation. Option D would reduce lipolysis, contrary to ketogenic state.
Q2.
A researcher uses the Mifflin-St Jeor equation to estimate resting metabolic rate (RMR) in
a group of adults. Which scenario would most likely lead to a significant underestimation
of measured RMR?
A. Individuals with high lean body mass B. Individuals with obesity and low physical
activity
C. Older adults with sarcopenia D. Sedentary individuals with normal BMI
Correct: A - Individuals with high lean body mass
Rationale:Mifflin-St Jeor is less accurate in highly muscular individuals because it relies on
weight and height, not body composition. High lean mass increases actual RMR, leading to
underestimation. Obesity, sarcopenia, and sedentary normal-weight individuals have lower or
average lean mass, making underestimation less likely.
Q3.
In the context of the Dietary Guidelines for Americans 2020-2025, which of the following
dietary patterns would be most likely to meet the recommended limits for added sugars
and saturated fats while providing adequate potassium and fiber?
Page 3
, Section A - Nutritional Assessment AND Diagnosis
A. A vegan diet emphasizing refined grains B. A Mediterranean-style diet with moderate
and fruit juices fish and olive oil
C. A low-carbohydrate diet high in red meat D. A typical Western diet with fortified
and butter cereals
Correct: B - A Mediterranean-style diet with moderate fish and olive oil
Rationale:The Mediterranean pattern aligns with DGA recommendations: low in added
sugars and saturated fat, high in fiber and potassium from plant foods. Vegan with refined
grains/juices is high in added sugar and low in potassium. Low-carb with red meat/butter is
high in saturated fat. Western diet is high in added sugars and sodium.
Q4.
During the first trimester of pregnancy, a woman's energy needs increase minimally.
However, her need for which nutrient increases substantially due to its role in neural tube
development?
A. Iron B. Folate
C. Calcium D. Vitamin B12
Correct: B - Folate
Rationale:Folate requirements increase by about 50% in pregnancy to support rapid cell
division and neural tube closure, which occurs in the first 28 days post-conception. Iron needs
increase later due to expanded blood volume. Calcium needs do not increase during
pregnancy (absorption increases). B12 needs increase but not as dramatically as folate.
Q5.
A patient with chronic kidney disease (CKD) has hyperkalemia. Which dietary modification
is most appropriate to address this electrolyte imbalance?
A. Increasing intake of bananas and B. Restricting high-potassium foods such as
oranges potatoes and tomatoes
C. Supplementing with potassium chloride D. Encouraging a high-protein diet to
salt substitutes improve renal function
Correct: B - Restricting high-potassium foods such as potatoes and tomatoes
Rationale:Hyperkalemia in CKD requires limiting dietary potassium. Bananas, oranges,
potatoes, and tomatoes are high-potassium. Salt substitutes contain potassium chloride and
should be avoided. High-protein diets can increase renal workload and potassium load.
Page 4
