1
WGU NUTRITION D440 COMPLETED STUDY
GUIDE Actual Exam 2026/2027 Complete Questions
and Verified Answers with Detailed Rationales Pass
Guaranteed - A+ Graded
Section 1: D440 Nutrition Comprehensive Study Guide
Q1: Which macronutrient provides the most energy per gram when metabolized?
A. Carbohydrate
B. Protein
C. Fat
D. Alcohol
C. Fat. [CORRECT]
Correct Answer: C
Rationale: Fat provides 9 kcal per gram, compared to 4 kcal per gram for both carbohydrate and
protein, and 7 kcal per gram for alcohol. This higher energy density makes fat the most
concentrated source of energy in the diet and influences portion control recommendations for
weight management.
Q2: A 45-year-old client with type 2 diabetes has a fasting blood glucose of 142 mg/dL and
HbA1c of 7.8%. According to the American Diabetes Association guidelines, what is the primary
nutrition intervention?
A. Eliminate all carbohydrate intake
B. Implement consistent carbohydrate counting (45-60g per meal) with emphasis on high-fiber,
low-glycemic index foods
C. Increase protein intake to 2.5 g/kg body weight
D. Recommend a very-low-calorie ketogenic diet exclusively
B. Implement consistent carbohydrate counting (45-60g per meal) with emphasis on high-fiber,
low-glycemic index foods. [CORRECT]
Correct Answer: B
Rationale: The ADA recommends individualized carbohydrate intake (typically 45-60g per meal
for many adults) with consistent timing to improve glycemic control. High-fiber, low-glycemic
,2
index carbohydrates slow glucose absorption and improve postprandial blood sugar. Total
carbohydrate amount and distribution are more important than type alone for glycemic
management.
Q3: Which water-soluble vitamin acts as a coenzyme in energy metabolism, specifically in the
conversion of pyruvate to acetyl-CoA for entry into the Krebs cycle?
A. Vitamin C
B. Thiamin (B1)
C. Vitamin B12
D. Folate
B. Thiamin (B1). [CORRECT]
Correct Answer: B
Rationale: Thiamin pyrophosphate (TPP), the active coenzyme form of thiamin, is essential for
decarboxylation reactions in glucose metabolism. TPP converts pyruvate to acetyl-CoA for Krebs
cycle entry and converts α-ketoglutarate to succinyl-CoA within the cycle. Thiamin deficiency
(beriberi) impairs energy production and causes lactic acidosis due to pyruvate accumulation.
Q4: A registered dietitian is conducting a nutritional assessment using the Nutrition Care Process
(NCP). Which step involves identifying "excessive energy intake" or "inadequate protein
intake"?
A. Nutrition Assessment
B. Nutrition Diagnosis
C. Nutrition Intervention
D. Nutrition Monitoring and Evaluation
B. Nutrition Diagnosis. [CORRECT]
Correct Answer: B
Rationale: The Nutrition Care Process includes four steps: Assessment (gathering data),
Diagnosis (identifying and labeling specific nutrition problems using PES format—Problem,
Etiology, Signs/Symptoms), Intervention (planning and implementing strategies), and
Monitoring/Evaluation (tracking outcomes). "Excessive energy intake" and "inadequate protein
intake" are standardized nutrition diagnostic terms from the Nutrition Diagnosis terminology.
Q5: Which mineral is the primary intracellular cation and is essential for maintaining resting
membrane potential, nerve transmission, and muscle contraction?
,3
A. Sodium
B. Potassium
C. Calcium
D. Magnesium
B. Potassium. [CORRECT]
Correct Answer: B
Rationale: Potassium is the principal intracellular cation (98% intracellular), with intracellular
concentration approximately 140-150 mEq/L compared to 3.5-5.0 mEq/L extracellularly. It
maintains the negative resting membrane potential essential for nerve impulse transmission and
muscle contraction. Hypokalemia causes cardiac arrhythmias, muscle weakness, and fatigue;
hyperkalemia causes life-threatening cardiac conduction abnormalities.
Q6: A client with chronic kidney disease stage 4 (eGFR 28 mL/min/1.73m²) requires nutrition
intervention. According to the National Kidney Foundation guidelines, what is the recommended
protein intake?
A. 1.2-1.5 g protein/kg body weight to prevent malnutrition
B. 0.6-0.8 g protein/kg body weight to reduce uremic symptoms and slow progression
C. 2.0 g protein/kg body weight to maintain muscle mass
D. Protein restriction is no longer recommended in CKD
B. 0.6-0.8 g protein/kg body weight to reduce uremic symptoms and slow progression.
[CORRECT]
Correct Answer: B
Rationale: The NKF KDOQI guidelines recommend 0.6-0.8 g protein/kg/day (50% high
biological value) for CKD stages 3-5 not on dialysis. Moderate protein restriction reduces
nitrogenous waste production, alleviates uremic symptoms, and may slow progression to end-
stage renal disease. Protein intake must be carefully monitored to prevent protein-energy wasting
while managing uremia.
Q7: Which type of dietary fiber increases fecal bulk and decreases transit time through the colon,
primarily exerting its effect through water absorption?
A. Soluble fiber
B. Insoluble fiber
C. Fermentable fiber
, 4
D. Resistant starch
B. Insoluble fiber. [CORRECT]
Correct Answer: B
Rationale: Insoluble fiber (cellulose, hemicellulose, lignin) does not dissolve in water and adds
bulk to stool by absorbing water, increasing fecal mass and decreasing intestinal transit time.
This mechanism prevents constipation and reduces risk of diverticular disease. Sources include
wheat bran, whole grains, and vegetables. Soluble fiber forms viscous gels and slows gastric
emptying.
Q8: A pregnant woman at 24 weeks gestation has a hemoglobin of 10.8 g/dL. What is the
appropriate nutrition intervention based on current guidelines?
A. No intervention; this is normal for pregnancy
B. Increase iron-rich foods and consider 30 mg elemental iron supplementation daily
C. Recommend blood transfusion immediately
D. Start high-dose iron (65 mg) three times daily
B. Increase iron-rich foods and consider 30 mg elemental iron supplementation daily.
[CORRECT]
Correct Answer: B
Rationale: The IOM defines anemia in pregnancy as hemoglobin <11.0 g/dL in first and third
trimesters, <10.5 g/dL in second trimester. This patient has mild anemia. First-line intervention
includes dietary counseling for heme iron sources (meat, poultry, fish) and vitamin C to enhance
absorption, plus 30 mg elemental iron daily. High-dose iron is reserved for moderate-severe
anemia (Hgb <9.0 g/dL) due to gastrointestinal side effects.
Q9: Which essential fatty acid is the precursor for eicosanoids that primarily produce anti-
inflammatory and vasodilatory effects?
A. Linoleic acid (omega-6)
B. Alpha-linolenic acid (omega-3)
C. Arachidonic acid
D. Palmitic acid
B. Alpha-linolenic acid (omega-3). [CORRECT]
Correct Answer: B
WGU NUTRITION D440 COMPLETED STUDY
GUIDE Actual Exam 2026/2027 Complete Questions
and Verified Answers with Detailed Rationales Pass
Guaranteed - A+ Graded
Section 1: D440 Nutrition Comprehensive Study Guide
Q1: Which macronutrient provides the most energy per gram when metabolized?
A. Carbohydrate
B. Protein
C. Fat
D. Alcohol
C. Fat. [CORRECT]
Correct Answer: C
Rationale: Fat provides 9 kcal per gram, compared to 4 kcal per gram for both carbohydrate and
protein, and 7 kcal per gram for alcohol. This higher energy density makes fat the most
concentrated source of energy in the diet and influences portion control recommendations for
weight management.
Q2: A 45-year-old client with type 2 diabetes has a fasting blood glucose of 142 mg/dL and
HbA1c of 7.8%. According to the American Diabetes Association guidelines, what is the primary
nutrition intervention?
A. Eliminate all carbohydrate intake
B. Implement consistent carbohydrate counting (45-60g per meal) with emphasis on high-fiber,
low-glycemic index foods
C. Increase protein intake to 2.5 g/kg body weight
D. Recommend a very-low-calorie ketogenic diet exclusively
B. Implement consistent carbohydrate counting (45-60g per meal) with emphasis on high-fiber,
low-glycemic index foods. [CORRECT]
Correct Answer: B
Rationale: The ADA recommends individualized carbohydrate intake (typically 45-60g per meal
for many adults) with consistent timing to improve glycemic control. High-fiber, low-glycemic
,2
index carbohydrates slow glucose absorption and improve postprandial blood sugar. Total
carbohydrate amount and distribution are more important than type alone for glycemic
management.
Q3: Which water-soluble vitamin acts as a coenzyme in energy metabolism, specifically in the
conversion of pyruvate to acetyl-CoA for entry into the Krebs cycle?
A. Vitamin C
B. Thiamin (B1)
C. Vitamin B12
D. Folate
B. Thiamin (B1). [CORRECT]
Correct Answer: B
Rationale: Thiamin pyrophosphate (TPP), the active coenzyme form of thiamin, is essential for
decarboxylation reactions in glucose metabolism. TPP converts pyruvate to acetyl-CoA for Krebs
cycle entry and converts α-ketoglutarate to succinyl-CoA within the cycle. Thiamin deficiency
(beriberi) impairs energy production and causes lactic acidosis due to pyruvate accumulation.
Q4: A registered dietitian is conducting a nutritional assessment using the Nutrition Care Process
(NCP). Which step involves identifying "excessive energy intake" or "inadequate protein
intake"?
A. Nutrition Assessment
B. Nutrition Diagnosis
C. Nutrition Intervention
D. Nutrition Monitoring and Evaluation
B. Nutrition Diagnosis. [CORRECT]
Correct Answer: B
Rationale: The Nutrition Care Process includes four steps: Assessment (gathering data),
Diagnosis (identifying and labeling specific nutrition problems using PES format—Problem,
Etiology, Signs/Symptoms), Intervention (planning and implementing strategies), and
Monitoring/Evaluation (tracking outcomes). "Excessive energy intake" and "inadequate protein
intake" are standardized nutrition diagnostic terms from the Nutrition Diagnosis terminology.
Q5: Which mineral is the primary intracellular cation and is essential for maintaining resting
membrane potential, nerve transmission, and muscle contraction?
,3
A. Sodium
B. Potassium
C. Calcium
D. Magnesium
B. Potassium. [CORRECT]
Correct Answer: B
Rationale: Potassium is the principal intracellular cation (98% intracellular), with intracellular
concentration approximately 140-150 mEq/L compared to 3.5-5.0 mEq/L extracellularly. It
maintains the negative resting membrane potential essential for nerve impulse transmission and
muscle contraction. Hypokalemia causes cardiac arrhythmias, muscle weakness, and fatigue;
hyperkalemia causes life-threatening cardiac conduction abnormalities.
Q6: A client with chronic kidney disease stage 4 (eGFR 28 mL/min/1.73m²) requires nutrition
intervention. According to the National Kidney Foundation guidelines, what is the recommended
protein intake?
A. 1.2-1.5 g protein/kg body weight to prevent malnutrition
B. 0.6-0.8 g protein/kg body weight to reduce uremic symptoms and slow progression
C. 2.0 g protein/kg body weight to maintain muscle mass
D. Protein restriction is no longer recommended in CKD
B. 0.6-0.8 g protein/kg body weight to reduce uremic symptoms and slow progression.
[CORRECT]
Correct Answer: B
Rationale: The NKF KDOQI guidelines recommend 0.6-0.8 g protein/kg/day (50% high
biological value) for CKD stages 3-5 not on dialysis. Moderate protein restriction reduces
nitrogenous waste production, alleviates uremic symptoms, and may slow progression to end-
stage renal disease. Protein intake must be carefully monitored to prevent protein-energy wasting
while managing uremia.
Q7: Which type of dietary fiber increases fecal bulk and decreases transit time through the colon,
primarily exerting its effect through water absorption?
A. Soluble fiber
B. Insoluble fiber
C. Fermentable fiber
, 4
D. Resistant starch
B. Insoluble fiber. [CORRECT]
Correct Answer: B
Rationale: Insoluble fiber (cellulose, hemicellulose, lignin) does not dissolve in water and adds
bulk to stool by absorbing water, increasing fecal mass and decreasing intestinal transit time.
This mechanism prevents constipation and reduces risk of diverticular disease. Sources include
wheat bran, whole grains, and vegetables. Soluble fiber forms viscous gels and slows gastric
emptying.
Q8: A pregnant woman at 24 weeks gestation has a hemoglobin of 10.8 g/dL. What is the
appropriate nutrition intervention based on current guidelines?
A. No intervention; this is normal for pregnancy
B. Increase iron-rich foods and consider 30 mg elemental iron supplementation daily
C. Recommend blood transfusion immediately
D. Start high-dose iron (65 mg) three times daily
B. Increase iron-rich foods and consider 30 mg elemental iron supplementation daily.
[CORRECT]
Correct Answer: B
Rationale: The IOM defines anemia in pregnancy as hemoglobin <11.0 g/dL in first and third
trimesters, <10.5 g/dL in second trimester. This patient has mild anemia. First-line intervention
includes dietary counseling for heme iron sources (meat, poultry, fish) and vitamin C to enhance
absorption, plus 30 mg elemental iron daily. High-dose iron is reserved for moderate-severe
anemia (Hgb <9.0 g/dL) due to gastrointestinal side effects.
Q9: Which essential fatty acid is the precursor for eicosanoids that primarily produce anti-
inflammatory and vasodilatory effects?
A. Linoleic acid (omega-6)
B. Alpha-linolenic acid (omega-3)
C. Arachidonic acid
D. Palmitic acid
B. Alpha-linolenic acid (omega-3). [CORRECT]
Correct Answer: B
