DHN 101 – HUMAN NUTRITION AND WELLNESS
EXAM 3 ULTIMATE PRACTICE TEST BANK – 150
MOST TESTED QUESTIONS Complete Questions with
Detailed Answers & Clinical Rationales | Updated for
2026/2027
This comprehensive practice test bank contains 150 meticulously crafted
questions covering the most frequently tested concepts in Human Nutrition
and Wellness. Each question includes a detailed rationale to deepen your
understanding and ensure exam success.
Key Features:
- ✅ 150 Authentic Exam-Style Questions
- ✅ Detailed Clinical Rationales for Every Answer
- ✅ Based on Current Nutrition Science and Dietary Guidelines
- ✅ Covers All Core Topics: Macronutrients, Micronutrients, Metabolism,
Lifecycle Nutrition, and Chronic Disease Prevention
- ✅ Complete Answer Key for Quick Reference
- ✅ Updated for 2026/2027 Academic Year
SECTION 1: FOUNDATIONS OF NUTRITION (Questions 1-30)
,Question 1
Which of the following is the primary source of energy for the human body?
A) Proteins
B) Fats
C) Carbohydrates
D) Vitamins
Correct Answer: C
Rationale: Carbohydrates are the body's preferred and primary energy source,
providing 4 kcal per gram and being readily converted to glucose for cellular
energy production. While fats provide more energy per gram (9 kcal/g),
carbohydrates are the body's first choice for fuel. Proteins are primarily used
for tissue repair and growth, not as a primary energy source. Vitamins do not
provide energy.
Question 2
What is the definition of a kilocalorie (kcal)?
A) The amount of heat needed to raise 1 gram of water by 10°C
B) The amount of heat needed to raise 1 kilogram of water by 1°C
C) The amount of energy in 1 gram of protein
D) The unit measuring vitamin content in food
Correct Answer: B
,Rationale: A kilocalorie is scientifically defined as the heat energy required to
increase the temperature of one kilogram of water by one degree Celsius. This
is the standard unit used to measure the energy content of food. Option A
describes a calorie (not a kilocalorie). Options C and D are incorrect.
Question 3
Which nutrient provides 9 kcal per gram?
A) Carbohydrate
B) Protein
C) Fat
D) Alcohol
Correct Answer: C
Rationale: Dietary fat is the most energy-dense macronutrient, providing 9
kcal per gram, compared to 4 kcal/g for carbohydrates and proteins. Alcohol
provides 7 kcal/g but is not considered a nutrient. Fats are essential for
hormone production, cell membrane structure, and absorption of fat-soluble
vitamins.
, Question 4
What are the six classes of essential nutrients?
A) Carbohydrates, proteins, fats, vitamins, minerals, fiber
B) Carbohydrates, proteins, fats, vitamins, minerals, water
C) Carbohydrates, proteins, fats, fiber, water, enzymes
D) Carbohydrates, proteins, fats, vitamins, fiber, phytochemicals
Correct Answer: B
Rationale: The six essential nutrient classes are carbohydrates, proteins, lipids
(fats), vitamins, minerals, and water. Fiber is a type of carbohydrate, not a
separate class. Enzymes are proteins that catalyze reactions, and
phytochemicals are beneficial plant compounds but are not classified as
essential nutrients.
Question 5
Which term describes nutrients that must be obtained from the diet because
the body cannot manufacture them in sufficient amounts?
A) Macronutrients
B) Micronutrients
C) Non-essential nutrients
D) Essential nutrients
Correct Answer: D
EXAM 3 ULTIMATE PRACTICE TEST BANK – 150
MOST TESTED QUESTIONS Complete Questions with
Detailed Answers & Clinical Rationales | Updated for
2026/2027
This comprehensive practice test bank contains 150 meticulously crafted
questions covering the most frequently tested concepts in Human Nutrition
and Wellness. Each question includes a detailed rationale to deepen your
understanding and ensure exam success.
Key Features:
- ✅ 150 Authentic Exam-Style Questions
- ✅ Detailed Clinical Rationales for Every Answer
- ✅ Based on Current Nutrition Science and Dietary Guidelines
- ✅ Covers All Core Topics: Macronutrients, Micronutrients, Metabolism,
Lifecycle Nutrition, and Chronic Disease Prevention
- ✅ Complete Answer Key for Quick Reference
- ✅ Updated for 2026/2027 Academic Year
SECTION 1: FOUNDATIONS OF NUTRITION (Questions 1-30)
,Question 1
Which of the following is the primary source of energy for the human body?
A) Proteins
B) Fats
C) Carbohydrates
D) Vitamins
Correct Answer: C
Rationale: Carbohydrates are the body's preferred and primary energy source,
providing 4 kcal per gram and being readily converted to glucose for cellular
energy production. While fats provide more energy per gram (9 kcal/g),
carbohydrates are the body's first choice for fuel. Proteins are primarily used
for tissue repair and growth, not as a primary energy source. Vitamins do not
provide energy.
Question 2
What is the definition of a kilocalorie (kcal)?
A) The amount of heat needed to raise 1 gram of water by 10°C
B) The amount of heat needed to raise 1 kilogram of water by 1°C
C) The amount of energy in 1 gram of protein
D) The unit measuring vitamin content in food
Correct Answer: B
,Rationale: A kilocalorie is scientifically defined as the heat energy required to
increase the temperature of one kilogram of water by one degree Celsius. This
is the standard unit used to measure the energy content of food. Option A
describes a calorie (not a kilocalorie). Options C and D are incorrect.
Question 3
Which nutrient provides 9 kcal per gram?
A) Carbohydrate
B) Protein
C) Fat
D) Alcohol
Correct Answer: C
Rationale: Dietary fat is the most energy-dense macronutrient, providing 9
kcal per gram, compared to 4 kcal/g for carbohydrates and proteins. Alcohol
provides 7 kcal/g but is not considered a nutrient. Fats are essential for
hormone production, cell membrane structure, and absorption of fat-soluble
vitamins.
, Question 4
What are the six classes of essential nutrients?
A) Carbohydrates, proteins, fats, vitamins, minerals, fiber
B) Carbohydrates, proteins, fats, vitamins, minerals, water
C) Carbohydrates, proteins, fats, fiber, water, enzymes
D) Carbohydrates, proteins, fats, vitamins, fiber, phytochemicals
Correct Answer: B
Rationale: The six essential nutrient classes are carbohydrates, proteins, lipids
(fats), vitamins, minerals, and water. Fiber is a type of carbohydrate, not a
separate class. Enzymes are proteins that catalyze reactions, and
phytochemicals are beneficial plant compounds but are not classified as
essential nutrients.
Question 5
Which term describes nutrients that must be obtained from the diet because
the body cannot manufacture them in sufficient amounts?
A) Macronutrients
B) Micronutrients
C) Non-essential nutrients
D) Essential nutrients
Correct Answer: D
