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WGU D440 Nutrition Pre-Assessment
Exam Study Guide | 300 Practice
Questions with Answers & Rationales |
Health & Wellness Through Nutritional
Sciences | Latest 2026 Update for
Nursing & Health Students
Pass the WGU D440 Nutrition Pre-Assessment on your
first attempt with this comprehensive study guide! This
resource includes 300 multiple-choice questions
mirroring the actual exam format, covering
Macronutrients, Micronutrients, Life Cycle Nutrition,
Digestion, Dietary Guidelines, Food Safety, and Chronic
Disease Prevention. Every answer includes a detailed
rationale to reinforce your understanding. Designed
specifically for WGU, Chamberlain, GCU, Walden, and
Capella nursing students. Updated for 2026 HESI
standards. Perfect for last-minute review or deep-dive
studying. Download now and guarantee your succes
Question 1
Which macronutrient provides the most concentrated source of energy per gram?
A) Carbohydrates
B) Proteins
C) Fats
D) Alcohol
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Answer: C) Fats
Rationale: Fats provide 9 kcal per gram, making them the most energy-dense
macronutrient compared to carbohydrates and proteins which provide 4 kcal per gram.
Question 2
Which of the following is classified as a complete protein source?
A) Lentils
B) Brown rice
C) Eggs
D) Peanut butter
Answer: C) Eggs
Rationale: Animal sources including eggs, meat, poultry, fish, and dairy, as well as soy,
contain all nine essential amino acids and are classified as complete proteins. Plant
proteins are generally incomplete.
Question 3
Which vitamin is essential for blood clotting?
A) Vitamin A
B) Vitamin D
C) Vitamin E
D) Vitamin K
Answer: D) Vitamin K
Rationale: Vitamin K is essential for the synthesis of blood clotting factors II, VII, IX, and
X. Patients on warfarin therapy must maintain consistent vitamin K intake.
Question 4
A deficiency in which vitamin is associated with Beriberi and Wernicke-Korsakoff
syndrome?
A) Vitamin B1 (Thiamine)
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B) Vitamin B2 (Riboflavin)
C) Vitamin B3 (Niacin)
D) Vitamin B12 (Cobalamin)
Answer: A) Vitamin B1 (Thiamine)
Rationale: Thiamine deficiency is commonly associated with alcoholism and can lead
to Beriberi and Wernicke-Korsakoff syndrome, characterized by neurological and
cardiovascular symptoms.
Question 5
What is the primary source of fuel for the brain?
A) Fats
B) Proteins
C) Carbohydrates
D) Ketones
Answer: C) Carbohydrates
Rationale: Carbohydrates provide the main source of fuel for the brain. The brain relies
heavily on glucose derived from carbohydrate metabolism for proper function.
Question 6
Which vitamin deficiency presents with the classic triad of dermatitis, diarrhea, and
dementia?
A) Vitamin B1 (Thiamine)
B) Vitamin B2 (Riboflavin)
C) Vitamin B3 (Niacin)
D) Vitamin B6 (Pyridoxine)
Answer: C) Vitamin B3 (Niacin)
Rationale: Pellagra, caused by niacin deficiency, presents with the "three D's" –
dermatitis, diarrhea, and dementia. Severe deficiency can also lead to death.
, 4|Page
Question 7
Which of the following is a water-soluble vitamin?
A) Vitamin A
B) Vitamin D
C) Vitamin E
D) Vitamin C
Answer: D) Vitamin C
Rationale: Vitamin C is water-soluble along with the B-complex vitamins. Water-
soluble vitamins are not stored in the body and require regular daily intake as they are
excreted in urine.
Question 8
A patient following a vegan diet is at highest risk for deficiency of which vitamin?
A) Vitamin C
B) Vitamin B12
C) Folate
D) Vitamin B6
Answer: B) Vitamin B12
Rationale: Vitamin B12 is found naturally only in animal products. Vegans are at
significant risk for B12 deficiency, which can cause macrocytic anemia and neuropathy.
Question 9
Which mineral is critical for maintaining proper cardiac rhythm?
A) Iron
B) Calcium
C) Potassium
D) Zinc
Answer: C) Potassium
Rationale: Potassium is critical for cardiac rhythm and muscle function. Both
hypokalemia and hyperkalemia can cause life-threatening cardiac arrhythmias.
WGU D440 Nutrition Pre-Assessment
Exam Study Guide | 300 Practice
Questions with Answers & Rationales |
Health & Wellness Through Nutritional
Sciences | Latest 2026 Update for
Nursing & Health Students
Pass the WGU D440 Nutrition Pre-Assessment on your
first attempt with this comprehensive study guide! This
resource includes 300 multiple-choice questions
mirroring the actual exam format, covering
Macronutrients, Micronutrients, Life Cycle Nutrition,
Digestion, Dietary Guidelines, Food Safety, and Chronic
Disease Prevention. Every answer includes a detailed
rationale to reinforce your understanding. Designed
specifically for WGU, Chamberlain, GCU, Walden, and
Capella nursing students. Updated for 2026 HESI
standards. Perfect for last-minute review or deep-dive
studying. Download now and guarantee your succes
Question 1
Which macronutrient provides the most concentrated source of energy per gram?
A) Carbohydrates
B) Proteins
C) Fats
D) Alcohol
,2|Page
Answer: C) Fats
Rationale: Fats provide 9 kcal per gram, making them the most energy-dense
macronutrient compared to carbohydrates and proteins which provide 4 kcal per gram.
Question 2
Which of the following is classified as a complete protein source?
A) Lentils
B) Brown rice
C) Eggs
D) Peanut butter
Answer: C) Eggs
Rationale: Animal sources including eggs, meat, poultry, fish, and dairy, as well as soy,
contain all nine essential amino acids and are classified as complete proteins. Plant
proteins are generally incomplete.
Question 3
Which vitamin is essential for blood clotting?
A) Vitamin A
B) Vitamin D
C) Vitamin E
D) Vitamin K
Answer: D) Vitamin K
Rationale: Vitamin K is essential for the synthesis of blood clotting factors II, VII, IX, and
X. Patients on warfarin therapy must maintain consistent vitamin K intake.
Question 4
A deficiency in which vitamin is associated with Beriberi and Wernicke-Korsakoff
syndrome?
A) Vitamin B1 (Thiamine)
,3|Page
B) Vitamin B2 (Riboflavin)
C) Vitamin B3 (Niacin)
D) Vitamin B12 (Cobalamin)
Answer: A) Vitamin B1 (Thiamine)
Rationale: Thiamine deficiency is commonly associated with alcoholism and can lead
to Beriberi and Wernicke-Korsakoff syndrome, characterized by neurological and
cardiovascular symptoms.
Question 5
What is the primary source of fuel for the brain?
A) Fats
B) Proteins
C) Carbohydrates
D) Ketones
Answer: C) Carbohydrates
Rationale: Carbohydrates provide the main source of fuel for the brain. The brain relies
heavily on glucose derived from carbohydrate metabolism for proper function.
Question 6
Which vitamin deficiency presents with the classic triad of dermatitis, diarrhea, and
dementia?
A) Vitamin B1 (Thiamine)
B) Vitamin B2 (Riboflavin)
C) Vitamin B3 (Niacin)
D) Vitamin B6 (Pyridoxine)
Answer: C) Vitamin B3 (Niacin)
Rationale: Pellagra, caused by niacin deficiency, presents with the "three D's" –
dermatitis, diarrhea, and dementia. Severe deficiency can also lead to death.
, 4|Page
Question 7
Which of the following is a water-soluble vitamin?
A) Vitamin A
B) Vitamin D
C) Vitamin E
D) Vitamin C
Answer: D) Vitamin C
Rationale: Vitamin C is water-soluble along with the B-complex vitamins. Water-
soluble vitamins are not stored in the body and require regular daily intake as they are
excreted in urine.
Question 8
A patient following a vegan diet is at highest risk for deficiency of which vitamin?
A) Vitamin C
B) Vitamin B12
C) Folate
D) Vitamin B6
Answer: B) Vitamin B12
Rationale: Vitamin B12 is found naturally only in animal products. Vegans are at
significant risk for B12 deficiency, which can cause macrocytic anemia and neuropathy.
Question 9
Which mineral is critical for maintaining proper cardiac rhythm?
A) Iron
B) Calcium
C) Potassium
D) Zinc
Answer: C) Potassium
Rationale: Potassium is critical for cardiac rhythm and muscle function. Both
hypokalemia and hyperkalemia can cause life-threatening cardiac arrhythmias.
