WGU D440 OA HEALTH AND NUTRITION 2026 ACTUAL
EXAM REVIEW 200 QUESTIONS AND CORRECT ANSWERS
WITH RATIONALES COVERING THE CURRENT MOST TESTED
QUESTIONS GUARANTEE A+ GRADE
1. Which nutrient is the primary source of energy for the body?
☑ A. Carbohydrates
☐ B. Protein
☐ C. Fat
☐ D. Vitamins
Rationale: Carbohydrates are efficiently converted to glucose, the main energy source for cells.
2. Which vitamin is essential for blood clotting?
☑ A. Vitamin K
☐ B. Vitamin D
☐ C. Vitamin A
☐ D. Vitamin C
Rationale: Vitamin K is necessary for synthesizing clotting factors in the liver.
3. What is the recommended daily intake of water for adult men?
☑ A. About 3.7 liters
☐ B. About 2 liters
☐ C. About 5 liters
☐ D. About 1.5 liters
Rationale: The Institute of Medicine recommends approximately 3.7 liters per day from all beverages
and foods for adult men.
4. Which mineral is most important for bone health?
☑ A. Calcium
☐ B. Iron
☐ C. Sodium
☐ D. Potassium
Rationale: Calcium is critical for bone formation and maintenance.
5. Which macronutrient is primarily used for tissue repair?
☑ A. Protein
,☐ B. Carbohydrates
☐ C. Fats
☐ D. Fiber
Rationale: Proteins provide amino acids necessary for growth, repair, and maintenance of body tissues.
6. Which type of fat is considered heart-healthy?
☑ A. Unsaturated fats
☐ B. Saturated fats
☐ C. Trans fats
☐ D. Hydrogenated fats
Rationale: Unsaturated fats (monounsaturated and polyunsaturated) help reduce LDL cholesterol.
7. A deficiency of vitamin C can lead to which condition?
☑ A. Scurvy
☐ B. Rickets
☐ C. Night blindness
☐ D. Goiter
Rationale: Vitamin C deficiency impairs collagen synthesis, causing scurvy symptoms.
8. Which nutrient helps regulate fluid balance and nerve function?
☑ A. Sodium
☐ B. Vitamin D
☐ C. Calcium
☐ D. Fiber
Rationale: Sodium maintains fluid balance and is essential for proper nerve transmission.
9. What is the primary function of dietary fiber?
☑ A. Promote digestive health
☐ B. Provide energy
☐ C. Build muscle
☐ D. Carry oxygen
Rationale: Fiber adds bulk to stool, supports bowel regularity, and helps regulate blood sugar and
cholesterol.
10. Which vitamin is fat-soluble?
☑ A. Vitamin A
☐ B. Vitamin C
,☐ C. Vitamin B12
☐ D. Vitamin B6
Rationale: Vitamins A, D, E, and K are fat-soluble and stored in body fat.
11. Which type of carbohydrate provides quick energy?
☑ A. Simple sugars
☐ B. Starches
☐ C. Fiber
☐ D. Protein
Rationale: Simple sugars are rapidly digested and absorbed for fast energy.
12. Which mineral is crucial for oxygen transport in the blood?
☑ A. Iron
☐ B. Calcium
☐ C. Magnesium
☐ D. Zinc
Rationale: Iron is a component of hemoglobin, which carries oxygen in red blood cells.
13. Which nutrient deficiency can cause rickets in children?
☑ A. Vitamin D
☐ B. Vitamin C
☐ C. Iron
☐ D. Iodine
Rationale: Vitamin D deficiency impairs calcium absorption, leading to weak bones.
14. Which of the following is a water-soluble vitamin?
☑ A. Vitamin C
☐ B. Vitamin A
☐ C. Vitamin D
☐ D. Vitamin K
Rationale: Water-soluble vitamins dissolve in water and are not stored long-term.
15. What is the main role of antioxidants in the diet?
☑ A. Protect cells from damage
☐ B. Provide energy
☐ C. Build muscles
, ☐ D. Aid in blood clotting
Rationale: Antioxidants neutralize free radicals, protecting cells from damage.
16. Which nutrient is essential for thyroid function?
☑ A. Iodine
☐ B. Calcium
☐ C. Potassium
☐ D. Magnesium
Rationale: Iodine is needed to produce thyroid hormones that regulate metabolism.
17. Which type of fat should be limited to reduce cardiovascular risk?
☑ A. Trans fats
☐ B. Monounsaturated fats
☐ C. Polyunsaturated fats
☐ D. Omega-3 fats
Rationale: Trans fats raise LDL cholesterol and increase heart disease risk.
18. Which mineral is important for nerve and muscle function?
☑ A. Potassium
☐ B. Iron
☐ C. Calcium
☐ D. Zinc
Rationale: Potassium is critical for nerve signaling and muscle contraction.
19. Which nutrient deficiency can lead to anemia?
☑ A. Iron
☐ B. Vitamin C
☐ C. Vitamin A
☐ D. Calcium
Rationale: Iron deficiency reduces hemoglobin production, causing anemia.
20. Which macronutrient provides the most calories per gram?
☑ A. Fat
☐ B. Carbohydrates
☐ C. Protein
☐ D. Water
Rationale: Fat provides 9 kcal/g, more than carbs or protein (4 kcal/g).
EXAM REVIEW 200 QUESTIONS AND CORRECT ANSWERS
WITH RATIONALES COVERING THE CURRENT MOST TESTED
QUESTIONS GUARANTEE A+ GRADE
1. Which nutrient is the primary source of energy for the body?
☑ A. Carbohydrates
☐ B. Protein
☐ C. Fat
☐ D. Vitamins
Rationale: Carbohydrates are efficiently converted to glucose, the main energy source for cells.
2. Which vitamin is essential for blood clotting?
☑ A. Vitamin K
☐ B. Vitamin D
☐ C. Vitamin A
☐ D. Vitamin C
Rationale: Vitamin K is necessary for synthesizing clotting factors in the liver.
3. What is the recommended daily intake of water for adult men?
☑ A. About 3.7 liters
☐ B. About 2 liters
☐ C. About 5 liters
☐ D. About 1.5 liters
Rationale: The Institute of Medicine recommends approximately 3.7 liters per day from all beverages
and foods for adult men.
4. Which mineral is most important for bone health?
☑ A. Calcium
☐ B. Iron
☐ C. Sodium
☐ D. Potassium
Rationale: Calcium is critical for bone formation and maintenance.
5. Which macronutrient is primarily used for tissue repair?
☑ A. Protein
,☐ B. Carbohydrates
☐ C. Fats
☐ D. Fiber
Rationale: Proteins provide amino acids necessary for growth, repair, and maintenance of body tissues.
6. Which type of fat is considered heart-healthy?
☑ A. Unsaturated fats
☐ B. Saturated fats
☐ C. Trans fats
☐ D. Hydrogenated fats
Rationale: Unsaturated fats (monounsaturated and polyunsaturated) help reduce LDL cholesterol.
7. A deficiency of vitamin C can lead to which condition?
☑ A. Scurvy
☐ B. Rickets
☐ C. Night blindness
☐ D. Goiter
Rationale: Vitamin C deficiency impairs collagen synthesis, causing scurvy symptoms.
8. Which nutrient helps regulate fluid balance and nerve function?
☑ A. Sodium
☐ B. Vitamin D
☐ C. Calcium
☐ D. Fiber
Rationale: Sodium maintains fluid balance and is essential for proper nerve transmission.
9. What is the primary function of dietary fiber?
☑ A. Promote digestive health
☐ B. Provide energy
☐ C. Build muscle
☐ D. Carry oxygen
Rationale: Fiber adds bulk to stool, supports bowel regularity, and helps regulate blood sugar and
cholesterol.
10. Which vitamin is fat-soluble?
☑ A. Vitamin A
☐ B. Vitamin C
,☐ C. Vitamin B12
☐ D. Vitamin B6
Rationale: Vitamins A, D, E, and K are fat-soluble and stored in body fat.
11. Which type of carbohydrate provides quick energy?
☑ A. Simple sugars
☐ B. Starches
☐ C. Fiber
☐ D. Protein
Rationale: Simple sugars are rapidly digested and absorbed for fast energy.
12. Which mineral is crucial for oxygen transport in the blood?
☑ A. Iron
☐ B. Calcium
☐ C. Magnesium
☐ D. Zinc
Rationale: Iron is a component of hemoglobin, which carries oxygen in red blood cells.
13. Which nutrient deficiency can cause rickets in children?
☑ A. Vitamin D
☐ B. Vitamin C
☐ C. Iron
☐ D. Iodine
Rationale: Vitamin D deficiency impairs calcium absorption, leading to weak bones.
14. Which of the following is a water-soluble vitamin?
☑ A. Vitamin C
☐ B. Vitamin A
☐ C. Vitamin D
☐ D. Vitamin K
Rationale: Water-soluble vitamins dissolve in water and are not stored long-term.
15. What is the main role of antioxidants in the diet?
☑ A. Protect cells from damage
☐ B. Provide energy
☐ C. Build muscles
, ☐ D. Aid in blood clotting
Rationale: Antioxidants neutralize free radicals, protecting cells from damage.
16. Which nutrient is essential for thyroid function?
☑ A. Iodine
☐ B. Calcium
☐ C. Potassium
☐ D. Magnesium
Rationale: Iodine is needed to produce thyroid hormones that regulate metabolism.
17. Which type of fat should be limited to reduce cardiovascular risk?
☑ A. Trans fats
☐ B. Monounsaturated fats
☐ C. Polyunsaturated fats
☐ D. Omega-3 fats
Rationale: Trans fats raise LDL cholesterol and increase heart disease risk.
18. Which mineral is important for nerve and muscle function?
☑ A. Potassium
☐ B. Iron
☐ C. Calcium
☐ D. Zinc
Rationale: Potassium is critical for nerve signaling and muscle contraction.
19. Which nutrient deficiency can lead to anemia?
☑ A. Iron
☐ B. Vitamin C
☐ C. Vitamin A
☐ D. Calcium
Rationale: Iron deficiency reduces hemoglobin production, causing anemia.
20. Which macronutrient provides the most calories per gram?
☑ A. Fat
☐ B. Carbohydrates
☐ C. Protein
☐ D. Water
Rationale: Fat provides 9 kcal/g, more than carbs or protein (4 kcal/g).
