Understanding Nutrition Whitney Rolfes 16th Ed. Ch.1-20
Test Bank Actual Exam 2026/2027 – Comprehensive Exam
with Detailed Rationales | 100% Verified | Pass Guaranteed –
A+ Graded
Section 1: Chapter 1-3: Overview of Nutrition, Diet Planning, Digestion
(15 questions)
Q1: The primary driver of food selection for most individuals is:
A. Nutritional value
B. Taste
C. Cost
D. Convenience
Correct Answer: B
Rationale: While nutrition, cost, and convenience influence food choices, taste is the
primary driver of food selection for most individuals, as taste preferences are shaped by
genetics, culture, and early exposure.
Q2: Which of the following is classified as a macronutrient?
A. Vitamin C
B. Carbohydrate
C. Iron
D. Vitamin D
Correct Answer: B
Rationale: Macronutrients (carbohydrates, proteins, lipids, and water) are required in
relatively large amounts and provide energy; micronutrients (vitamins and minerals) are
needed in smaller quantities.
Q3: Which nutrient is classified as inorganic?
A. Carbohydrate
B. Protein
C. Mineral
,D. Lipid
Correct Answer: C
Rationale: Minerals are inorganic nutrients that do not contain carbon-hydrogen bonds;
carbohydrates, proteins, and lipids are organic compounds containing carbon.
Q4: An essential nutrient is defined as one that:
A. Can be synthesized by the body in adequate amounts
B. Must be obtained from the diet because the body cannot make it or cannot make it in
sufficient quantities
C. Is only found in supplements
D. Is required only during illness
Correct Answer: B
Rationale: Essential nutrients are those that the body cannot synthesize in adequate
amounts or at all, making dietary intake necessary for normal physiological function
and health maintenance.
Q5: A functional food is best defined as:
A. Any food that provides calories
B. A food that provides health benefits beyond its basic nutrient content
C. Only fortified foods
D. Only organic foods
Correct Answer: B
Rationale: Functional foods provide health benefits beyond basic nutrition, including
disease risk reduction or health promotion, through bioactive compounds such as
phytochemicals, probiotics, or omega-3 fatty acids.
Q6: Phytochemicals are:
A. Synthetic chemicals added to food
B. Bioactive compounds found in plants that may provide health benefits
C. Only found in animal products
D. Harmful substances in all plants
Correct Answer: B
Rationale: Phytochemicals are naturally occurring bioactive compounds in plants (e.g.,
carotenoids, flavonoids, isoflavones) that may reduce disease risk through antioxidant,
anti-inflammatory, and other mechanisms.
,Q7: Which of the following provides approximately 4 kcal per gram?
A. Alcohol
B. Carbohydrate
C. Fat
D. Both carbohydrate and protein
Correct Answer: D
Rationale: Both carbohydrates and proteins provide approximately 4 kcal per gram; fats
provide 9 kcal per gram, and alcohol provides 7 kcal per gram.
Q8: The energy yield from fat is approximately:
A. 4 kcal/g
B. 7 kcal/g
C. 9 kcal/g
D. 2 kcal/g
Correct Answer: C
Rationale: Fat provides approximately 9 kcal per gram, making it the most energy-dense
macronutrient; this high energy density contributes to its role in energy storage and
satiety.
Q9: Mechanical digestion begins in the:
A. Stomach
B. Small intestine
C. Mouth
D. Large intestine
Correct Answer: C
Rationale: Mechanical digestion begins in the mouth with mastication (chewing), which
breaks food into smaller particles and mixes it with saliva, increasing surface area for
enzymatic action.
Q10: The primary site of nutrient absorption is the:
A. Stomach
B. Small intestine
C. Large intestine
D. Esophagus
Correct Answer: B
, Rationale: The small intestine is the primary site of nutrient absorption due to its
extensive surface area (villi and microvilli), specialized transport mechanisms, and
proximity to the circulatory and lymphatic systems.
Q11: Bile is produced by the:
A. Gallbladder
B. Liver
C. Pancreas
D. Stomach
Correct Answer: B
Rationale: Bile is synthesized by the liver, stored and concentrated in the gallbladder,
and released into the small intestine to emulsify fats, facilitating lipase action and fat
absorption.
Q12: Lactose intolerance results from:
A. Excessive lactase production
B. Insufficient lactase enzyme production, leading to undigested lactose in the colon
C. Only milk allergy
D. Only bacterial infection
Correct Answer: B
Rationale: Lactose intolerance is caused by lactase deficiency, resulting in undigested
lactose reaching the colon where bacterial fermentation produces gas, bloating, and
diarrhea.
Q13: The Dietary Guidelines for Americans recommend limiting added sugars to:
A. Less than 50% of total calories
B. Less than 10% of total daily calories
C. Less than 25% of total calories
D. No limit
Correct Answer: B
Rationale: The Dietary Guidelines for Americans recommend limiting added sugars to
less than 10% of total daily calories to reduce risk of obesity, type 2 diabetes, and dental
caries.
Q14: Heartburn (gastroesophageal reflux) occurs when:
Test Bank Actual Exam 2026/2027 – Comprehensive Exam
with Detailed Rationales | 100% Verified | Pass Guaranteed –
A+ Graded
Section 1: Chapter 1-3: Overview of Nutrition, Diet Planning, Digestion
(15 questions)
Q1: The primary driver of food selection for most individuals is:
A. Nutritional value
B. Taste
C. Cost
D. Convenience
Correct Answer: B
Rationale: While nutrition, cost, and convenience influence food choices, taste is the
primary driver of food selection for most individuals, as taste preferences are shaped by
genetics, culture, and early exposure.
Q2: Which of the following is classified as a macronutrient?
A. Vitamin C
B. Carbohydrate
C. Iron
D. Vitamin D
Correct Answer: B
Rationale: Macronutrients (carbohydrates, proteins, lipids, and water) are required in
relatively large amounts and provide energy; micronutrients (vitamins and minerals) are
needed in smaller quantities.
Q3: Which nutrient is classified as inorganic?
A. Carbohydrate
B. Protein
C. Mineral
,D. Lipid
Correct Answer: C
Rationale: Minerals are inorganic nutrients that do not contain carbon-hydrogen bonds;
carbohydrates, proteins, and lipids are organic compounds containing carbon.
Q4: An essential nutrient is defined as one that:
A. Can be synthesized by the body in adequate amounts
B. Must be obtained from the diet because the body cannot make it or cannot make it in
sufficient quantities
C. Is only found in supplements
D. Is required only during illness
Correct Answer: B
Rationale: Essential nutrients are those that the body cannot synthesize in adequate
amounts or at all, making dietary intake necessary for normal physiological function
and health maintenance.
Q5: A functional food is best defined as:
A. Any food that provides calories
B. A food that provides health benefits beyond its basic nutrient content
C. Only fortified foods
D. Only organic foods
Correct Answer: B
Rationale: Functional foods provide health benefits beyond basic nutrition, including
disease risk reduction or health promotion, through bioactive compounds such as
phytochemicals, probiotics, or omega-3 fatty acids.
Q6: Phytochemicals are:
A. Synthetic chemicals added to food
B. Bioactive compounds found in plants that may provide health benefits
C. Only found in animal products
D. Harmful substances in all plants
Correct Answer: B
Rationale: Phytochemicals are naturally occurring bioactive compounds in plants (e.g.,
carotenoids, flavonoids, isoflavones) that may reduce disease risk through antioxidant,
anti-inflammatory, and other mechanisms.
,Q7: Which of the following provides approximately 4 kcal per gram?
A. Alcohol
B. Carbohydrate
C. Fat
D. Both carbohydrate and protein
Correct Answer: D
Rationale: Both carbohydrates and proteins provide approximately 4 kcal per gram; fats
provide 9 kcal per gram, and alcohol provides 7 kcal per gram.
Q8: The energy yield from fat is approximately:
A. 4 kcal/g
B. 7 kcal/g
C. 9 kcal/g
D. 2 kcal/g
Correct Answer: C
Rationale: Fat provides approximately 9 kcal per gram, making it the most energy-dense
macronutrient; this high energy density contributes to its role in energy storage and
satiety.
Q9: Mechanical digestion begins in the:
A. Stomach
B. Small intestine
C. Mouth
D. Large intestine
Correct Answer: C
Rationale: Mechanical digestion begins in the mouth with mastication (chewing), which
breaks food into smaller particles and mixes it with saliva, increasing surface area for
enzymatic action.
Q10: The primary site of nutrient absorption is the:
A. Stomach
B. Small intestine
C. Large intestine
D. Esophagus
Correct Answer: B
, Rationale: The small intestine is the primary site of nutrient absorption due to its
extensive surface area (villi and microvilli), specialized transport mechanisms, and
proximity to the circulatory and lymphatic systems.
Q11: Bile is produced by the:
A. Gallbladder
B. Liver
C. Pancreas
D. Stomach
Correct Answer: B
Rationale: Bile is synthesized by the liver, stored and concentrated in the gallbladder,
and released into the small intestine to emulsify fats, facilitating lipase action and fat
absorption.
Q12: Lactose intolerance results from:
A. Excessive lactase production
B. Insufficient lactase enzyme production, leading to undigested lactose in the colon
C. Only milk allergy
D. Only bacterial infection
Correct Answer: B
Rationale: Lactose intolerance is caused by lactase deficiency, resulting in undigested
lactose reaching the colon where bacterial fermentation produces gas, bloating, and
diarrhea.
Q13: The Dietary Guidelines for Americans recommend limiting added sugars to:
A. Less than 50% of total calories
B. Less than 10% of total daily calories
C. Less than 25% of total calories
D. No limit
Correct Answer: B
Rationale: The Dietary Guidelines for Americans recommend limiting added sugars to
less than 10% of total daily calories to reduce risk of obesity, type 2 diabetes, and dental
caries.
Q14: Heartburn (gastroesophageal reflux) occurs when:
