WGU D440 NUTRITION OBJECTIVE ASSESSMENT LATEST
2026 EXAM PREPARATION | WGU D440 OA VERIFIED
PRACTICE TEST | COMPLETE NUTRITION STUDY GUIDE
WITH ACTUAL EXAM QUESTIONS AND ACCURATE
ANSWERS | UPDATED WGU HEALTH AND NUTRITION
EXAM SUCCESS MATERIAL
WGU D440 Nutrition Objective Assessment
Question 1: Which of the following is considered a macronutrient essential for energy
production?
a) Vitamins
b) Minerals
c) Carbohydrates
d) Antioxidants
Correct Option: c) Carbohydrates
Rationale: Carbohydrates are one of the three macronutrients (alongside proteins and fats) that
provide the body with energy. They are broken down into glucose, which is then used by the
body’s cells for fuel. Unlike vitamins and minerals, which are micronutrients, macronutrients are
required in larger quantities for energy production and bodily functions.
Question 2: What is the primary function of dietary fiber in the human body?
a) Increase blood sugar levels
b) Promote digestive health
c) Provide essential amino acids
d) Supply vitamins
Correct Option: b) Promote digestive health
Rationale: Dietary fiber plays a crucial role in maintaining digestive health by promoting
regular bowel movements, preventing constipation, and allowing for a healthy gut microbiome.
It also helps regulate blood sugar levels and may lower cholesterol, but its primary function
relates to digestion rather than direct nutrient supply.
Question 3: Which vitamin is primarily involved in calcium absorption?
a) Vitamin D
b) Vitamin C
c) Vitamin A
d) Vitamin E
, Correct Option: a) Vitamin D
Rationale: Vitamin D is essential for optimal calcium absorption in the intestines. It helps
regulate calcium and phosphorus levels in the blood, which are critical for maintaining bone and
dental health. Insufficient levels of Vitamin D can lead to deficiencies in calcium absorption,
resulting in weakened bones.
Question 4: What is the recommended daily intake of protein for an average adult?
a) 0.5 grams per kilogram of body weight
b) 0.8 grams per kilogram of body weight
c) 1.5 grams per kilogram of body weight
d) 2.0 grams per kilogram of body weight
Correct Option: b) 0.8 grams per kilogram of body weight
Rationale: The Recommended Dietary Allowance (RDA) for protein is approximately 0.8 grams
per kilogram of body weight for the average adult. This amount supports basic bodily functions
and maintains muscle mass. Individuals with higher levels of physical activity, pregnant women,
or those trying to gain muscle may require more protein.
Question 5: Which of the following fats is classified as unsaturated?
a) Butter
b) Olive oil
c) Lard
d) Coconut oil
Correct Option: b) Olive oil
Rationale: Olive oil is rich in monounsaturated fats, which are considered heart-healthy fats.
Unsaturated fats can help lower bad cholesterol levels and are associated with a reduced risk of
heart disease. In contrast, butter, lard, and coconut oil contain higher levels of saturated fats,
which can contribute to health issues when consumed in excess.
Question 6: Which mineral is vital for oxygen transport in the blood?
a) Calcium
b) Sodium
c) Iron
d) Potassium
Correct Option: c) Iron
Rationale: Iron is a key component of hemoglobin, the protein in red blood cells responsible for
2026 EXAM PREPARATION | WGU D440 OA VERIFIED
PRACTICE TEST | COMPLETE NUTRITION STUDY GUIDE
WITH ACTUAL EXAM QUESTIONS AND ACCURATE
ANSWERS | UPDATED WGU HEALTH AND NUTRITION
EXAM SUCCESS MATERIAL
WGU D440 Nutrition Objective Assessment
Question 1: Which of the following is considered a macronutrient essential for energy
production?
a) Vitamins
b) Minerals
c) Carbohydrates
d) Antioxidants
Correct Option: c) Carbohydrates
Rationale: Carbohydrates are one of the three macronutrients (alongside proteins and fats) that
provide the body with energy. They are broken down into glucose, which is then used by the
body’s cells for fuel. Unlike vitamins and minerals, which are micronutrients, macronutrients are
required in larger quantities for energy production and bodily functions.
Question 2: What is the primary function of dietary fiber in the human body?
a) Increase blood sugar levels
b) Promote digestive health
c) Provide essential amino acids
d) Supply vitamins
Correct Option: b) Promote digestive health
Rationale: Dietary fiber plays a crucial role in maintaining digestive health by promoting
regular bowel movements, preventing constipation, and allowing for a healthy gut microbiome.
It also helps regulate blood sugar levels and may lower cholesterol, but its primary function
relates to digestion rather than direct nutrient supply.
Question 3: Which vitamin is primarily involved in calcium absorption?
a) Vitamin D
b) Vitamin C
c) Vitamin A
d) Vitamin E
, Correct Option: a) Vitamin D
Rationale: Vitamin D is essential for optimal calcium absorption in the intestines. It helps
regulate calcium and phosphorus levels in the blood, which are critical for maintaining bone and
dental health. Insufficient levels of Vitamin D can lead to deficiencies in calcium absorption,
resulting in weakened bones.
Question 4: What is the recommended daily intake of protein for an average adult?
a) 0.5 grams per kilogram of body weight
b) 0.8 grams per kilogram of body weight
c) 1.5 grams per kilogram of body weight
d) 2.0 grams per kilogram of body weight
Correct Option: b) 0.8 grams per kilogram of body weight
Rationale: The Recommended Dietary Allowance (RDA) for protein is approximately 0.8 grams
per kilogram of body weight for the average adult. This amount supports basic bodily functions
and maintains muscle mass. Individuals with higher levels of physical activity, pregnant women,
or those trying to gain muscle may require more protein.
Question 5: Which of the following fats is classified as unsaturated?
a) Butter
b) Olive oil
c) Lard
d) Coconut oil
Correct Option: b) Olive oil
Rationale: Olive oil is rich in monounsaturated fats, which are considered heart-healthy fats.
Unsaturated fats can help lower bad cholesterol levels and are associated with a reduced risk of
heart disease. In contrast, butter, lard, and coconut oil contain higher levels of saturated fats,
which can contribute to health issues when consumed in excess.
Question 6: Which mineral is vital for oxygen transport in the blood?
a) Calcium
b) Sodium
c) Iron
d) Potassium
Correct Option: c) Iron
Rationale: Iron is a key component of hemoglobin, the protein in red blood cells responsible for
