WGU D440 Nutrition OA Exam – Complete Study Guide & 300+
Practice Questions (2026)
Section 1: Macronutrients & Energy Balance (Questions 1–40)
1. Which macronutrient provides the most concentrated source of
energy?
A) Protein
B) Carbohydrates
C) Fat
D) Fiber
Answer C: ) Fat
Rationale: Fat provides 9 calories per gram, while carbohydrates and
protein provide only 4 calories per gram. Fat is the most energy-
dense macronutrient.
,2. What is the primary function of carbohydrates in the body?
A) Hormone production
B) Primary energy source
C) Bone strengthening
D) Blood clotting
Answer B: ) Primary energy source
Rationale: Carbohydrates are the body's preferred and most readily
available source of energy. They are broken down into glucose, which
fuels cellular activities.
3. Which nutrient is primarily responsible for tissue repair and
muscle maintenance?
A) Fat
B) Carbohydrates
C) Protein
D) Fiber
Answer C: ) Protein
,Rationale: Protein is essential for growth, repair, and maintenance of
body tissues. It provides the amino acids necessary for building and
repairing muscle, skin, and organs.
4. The body stores excess glucose in the form of:
A) Glycogen
B) Ketones
C) Cholesterol
D) Triglycerides
Answer A: ) Glycogen
Rationale: Excess glucose is stored as glycogen in the liver and
muscles. When glycogen stores are full, excess glucose is converted
to fat.
5. Which nutrient is the body's preferred fuel source during
exercise?
A) Carbohydrates
B) Vitamins
C) Water
, D) Minerals
Answer A: ) Carbohydrates
Rationale: Carbohydrates are the body's preferred and most readily
available source of energy during exercise.
6. What is the Acceptable Macronutrient Distribution Range
(AMDR) for carbohydrates?
A) 10-35%
B) 20-35%
C) 45-65%
D) 5-20%
Answer C: ) 45-65%
Rationale: The AMDR for carbohydrates is 45-65% of total daily
calories. Carbohydrates serve as the body's primary energy source.
7. What is the AMDR for protein?
A) 10-35%
B) 20-35%
C) 45-65%
Practice Questions (2026)
Section 1: Macronutrients & Energy Balance (Questions 1–40)
1. Which macronutrient provides the most concentrated source of
energy?
A) Protein
B) Carbohydrates
C) Fat
D) Fiber
Answer C: ) Fat
Rationale: Fat provides 9 calories per gram, while carbohydrates and
protein provide only 4 calories per gram. Fat is the most energy-
dense macronutrient.
,2. What is the primary function of carbohydrates in the body?
A) Hormone production
B) Primary energy source
C) Bone strengthening
D) Blood clotting
Answer B: ) Primary energy source
Rationale: Carbohydrates are the body's preferred and most readily
available source of energy. They are broken down into glucose, which
fuels cellular activities.
3. Which nutrient is primarily responsible for tissue repair and
muscle maintenance?
A) Fat
B) Carbohydrates
C) Protein
D) Fiber
Answer C: ) Protein
,Rationale: Protein is essential for growth, repair, and maintenance of
body tissues. It provides the amino acids necessary for building and
repairing muscle, skin, and organs.
4. The body stores excess glucose in the form of:
A) Glycogen
B) Ketones
C) Cholesterol
D) Triglycerides
Answer A: ) Glycogen
Rationale: Excess glucose is stored as glycogen in the liver and
muscles. When glycogen stores are full, excess glucose is converted
to fat.
5. Which nutrient is the body's preferred fuel source during
exercise?
A) Carbohydrates
B) Vitamins
C) Water
, D) Minerals
Answer A: ) Carbohydrates
Rationale: Carbohydrates are the body's preferred and most readily
available source of energy during exercise.
6. What is the Acceptable Macronutrient Distribution Range
(AMDR) for carbohydrates?
A) 10-35%
B) 20-35%
C) 45-65%
D) 5-20%
Answer C: ) 45-65%
Rationale: The AMDR for carbohydrates is 45-65% of total daily
calories. Carbohydrates serve as the body's primary energy source.
7. What is the AMDR for protein?
A) 10-35%
B) 20-35%
C) 45-65%
