WGU D440 Nutrition OA Exam Prep - 2026 Edition UPDATE 2026 Update • Verified Answers
✓ VERIFIED • 2026 UPDATE • 100% ACCURATE
WGU D440 Nutrition OA Exam Prep - 2026 Edition
UPDATE
Actual Exam Questions & Verified Answers
with Detailed Rationales
Document Type: Exam (Elaborations)
Academic Year:
Total Questions: 50 Multiple Choice
Includes: Correct Answers + Full Rationales
Status: Verified & Updated for 2026
Exam (Elaborations) • Actual Questions & Rationales Page 1
,WGU D440 Nutrition OA Exam Prep - 2026 Edition UPDATE 2026 Update • Verified Answers
Questions & Verified Answers
1. Which macronutrient provides the highest energy density at 9 kilocalories per gram?
A. Carbohydrates
B. Proteins
C. Fats
D. Alcohol
Answer: C
Rationale: Fats provide 9 kcal/g, whereas carbohydrates and proteins provide 4 kcal/g, and alcohol provides 7
kcal/g. This is an important clinical concept because selecting the correct answer (C) requires understanding
both the pathophysiology and the practical nursing implications. Recognizing this principle allows the nurse to
prioritize care, anticipate complications, and provide accurate patient education.
2. A patient has a BMI of 28.5 kg/m2. How would this individual be classified according to
standard BMI categories?
A. Underweight
B. Overweight
C. Normal weight
D. Obese
Answer: B
Rationale: BMI between 25 and 29.9 is classified as overweight. 18.5-24.9 is normal, and 30 or above is
obese. This is an important clinical concept because selecting the correct answer (B) requires understanding
both the pathophysiology and the practical nursing implications. Recognizing this principle allows the nurse to
prioritize care, anticipate complications, and provide accurate patient education.
3. Which of the following is an example of a water-soluble vitamin that the body does not store
in large amounts?
A. Vitamin A
B. Vitamin D
C. Vitamin C
D. Vitamin K
Answer: C
Rationale: Vitamin C is water-soluble. Vitamins A, D, E, and K are fat-soluble and stored in the liver and fatty
tissues. Recognizing this principle allows the nurse to prioritize care, anticipate complications, and provide
accurate patient education. Exam questions often test the ability to distinguish this concept from closely related
distractors, making a clear rationale essential for mastery.
Exam (Elaborations) • Actual Questions & Rationales Page 2
, WGU D440 Nutrition OA Exam Prep - 2026 Edition UPDATE 2026 Update • Verified Answers
4. What is the primary site of nutrient absorption in the human digestive system?
A. Stomach
B. Small Intestine
C. Large Intestine
D. Esophagus
Answer: B
Rationale: The small intestine, specifically the duodenum and jejunum, is the primary site for the absorption of
most nutrients. Recognizing this principle allows the nurse to prioritize care, anticipate complications, and
provide accurate patient education. Exam questions often test the ability to distinguish this concept from closely
related distractors, making a clear rationale essential for mastery.
5. Which mineral is essential for the synthesis of thyroid hormones?
A. Iron
B. Zinc
C. Calcium
D. Iodine
Answer: D
Rationale: Iodine is a critical component of the thyroid hormones thyroxine (T4) and triiodothyronine (T3).
Exam questions often test the ability to distinguish this concept from closely related distractors, making a clear
rationale essential for mastery. Applying this knowledge in clinical settings supports safe, evidence-based
practice and improves patient outcomes.
6. Which dietary fiber type is known to help lower blood cholesterol levels?
A. Soluble fiber
B. Insoluble fiber
C. Cellulose
D. Lignin
Answer: A
Rationale: Soluble fiber binds to bile acids in the GI tract, promoting their excretion and forcing the liver to use
blood cholesterol to make more bile. Exam questions often test the ability to distinguish this concept from
closely related distractors, making a clear rationale essential for mastery. Applying this knowledge in clinical
settings supports safe, evidence-based practice and improves patient outcomes.
Exam (Elaborations) • Actual Questions & Rationales Page 3
✓ VERIFIED • 2026 UPDATE • 100% ACCURATE
WGU D440 Nutrition OA Exam Prep - 2026 Edition
UPDATE
Actual Exam Questions & Verified Answers
with Detailed Rationales
Document Type: Exam (Elaborations)
Academic Year:
Total Questions: 50 Multiple Choice
Includes: Correct Answers + Full Rationales
Status: Verified & Updated for 2026
Exam (Elaborations) • Actual Questions & Rationales Page 1
,WGU D440 Nutrition OA Exam Prep - 2026 Edition UPDATE 2026 Update • Verified Answers
Questions & Verified Answers
1. Which macronutrient provides the highest energy density at 9 kilocalories per gram?
A. Carbohydrates
B. Proteins
C. Fats
D. Alcohol
Answer: C
Rationale: Fats provide 9 kcal/g, whereas carbohydrates and proteins provide 4 kcal/g, and alcohol provides 7
kcal/g. This is an important clinical concept because selecting the correct answer (C) requires understanding
both the pathophysiology and the practical nursing implications. Recognizing this principle allows the nurse to
prioritize care, anticipate complications, and provide accurate patient education.
2. A patient has a BMI of 28.5 kg/m2. How would this individual be classified according to
standard BMI categories?
A. Underweight
B. Overweight
C. Normal weight
D. Obese
Answer: B
Rationale: BMI between 25 and 29.9 is classified as overweight. 18.5-24.9 is normal, and 30 or above is
obese. This is an important clinical concept because selecting the correct answer (B) requires understanding
both the pathophysiology and the practical nursing implications. Recognizing this principle allows the nurse to
prioritize care, anticipate complications, and provide accurate patient education.
3. Which of the following is an example of a water-soluble vitamin that the body does not store
in large amounts?
A. Vitamin A
B. Vitamin D
C. Vitamin C
D. Vitamin K
Answer: C
Rationale: Vitamin C is water-soluble. Vitamins A, D, E, and K are fat-soluble and stored in the liver and fatty
tissues. Recognizing this principle allows the nurse to prioritize care, anticipate complications, and provide
accurate patient education. Exam questions often test the ability to distinguish this concept from closely related
distractors, making a clear rationale essential for mastery.
Exam (Elaborations) • Actual Questions & Rationales Page 2
, WGU D440 Nutrition OA Exam Prep - 2026 Edition UPDATE 2026 Update • Verified Answers
4. What is the primary site of nutrient absorption in the human digestive system?
A. Stomach
B. Small Intestine
C. Large Intestine
D. Esophagus
Answer: B
Rationale: The small intestine, specifically the duodenum and jejunum, is the primary site for the absorption of
most nutrients. Recognizing this principle allows the nurse to prioritize care, anticipate complications, and
provide accurate patient education. Exam questions often test the ability to distinguish this concept from closely
related distractors, making a clear rationale essential for mastery.
5. Which mineral is essential for the synthesis of thyroid hormones?
A. Iron
B. Zinc
C. Calcium
D. Iodine
Answer: D
Rationale: Iodine is a critical component of the thyroid hormones thyroxine (T4) and triiodothyronine (T3).
Exam questions often test the ability to distinguish this concept from closely related distractors, making a clear
rationale essential for mastery. Applying this knowledge in clinical settings supports safe, evidence-based
practice and improves patient outcomes.
6. Which dietary fiber type is known to help lower blood cholesterol levels?
A. Soluble fiber
B. Insoluble fiber
C. Cellulose
D. Lignin
Answer: A
Rationale: Soluble fiber binds to bile acids in the GI tract, promoting their excretion and forcing the liver to use
blood cholesterol to make more bile. Exam questions often test the ability to distinguish this concept from
closely related distractors, making a clear rationale essential for mastery. Applying this knowledge in clinical
settings supports safe, evidence-based practice and improves patient outcomes.
Exam (Elaborations) • Actual Questions & Rationales Page 3
