Nutritional Foundations and Clinical Applications 2026/2027 | A Nursing
Approach 8th Edition by Grodner, Escott-Stump & Dorner Study Guide,
Nursing Nutrition Exam Prep, Practice Questions with Answers & Rationales,
Wellness Nutrition, Nutrient Metabolism, Carbohydrates, Fats, Proteins,
Vitamins, Minerals, Nutrition Assessment, Therapeutic Diets, Nutrition
Across the Life Span & Clinical Nutrition
Question 1: Which macronutrient provides the most concentrated source of
energy per gram?
A. Carbohydrate
B. Protein
C. Fat
D. Alcohol
CORRECT ANSWER: C. Fat
Rationale: Fat provides approximately 9 kcal per gram, whereas carbohydrate and
protein each provide approximately 4 kcal per gram. Alcohol provides
approximately 7 kcal per gram but is not classified as a macronutrient. Therefore,
fat is the most energy-dense macronutrient.
Question 2: Which organ is primarily responsible for the absorption of most
nutrients?
A. Stomach
B. Large intestine
C. Small intestine
D. Esophagus
CORRECT ANSWER: C. Small intestine
Rationale: The small intestine, particularly the jejunum and ileum, is the primary
site for the absorption of carbohydrates, proteins, fats, vitamins, and minerals.
The stomach primarily initiates digestion, while the large intestine mainly absorbs
water and electrolytes.
Question 3: Which enzyme begins the digestion of starch in the mouth?
A. Pepsin
B. Salivary amylase
,C. Lipase
D. Trypsin
CORRECT ANSWER: B. Salivary amylase
Rationale: Salivary amylase, also called ptyalin, is secreted by the salivary glands
and initiates the breakdown of starch into smaller polysaccharides and maltose in
the oral cavity. Pepsin and trypsin digest proteins, while lipase digests fats.
Question 4: Which nutrient is most important for building and repairing body
tissues?
A. Carbohydrate
B. Protein
C. Fat
D. Water
CORRECT ANSWER: B. Protein
Rationale: Protein is composed of amino acids that serve as the structural building
blocks for muscles, organs, skin, and other tissues. It is essential for tissue repair,
growth, and maintenance, particularly during illness, injury, and recovery.
Question 5: Which vitamin deficiency is most commonly associated with night
blindness?
A. Vitamin A
B. Vitamin B12
C. Vitamin C
D. Vitamin D
CORRECT ANSWER: A. Vitamin A
Rationale: Vitamin A is essential for the production of rhodopsin, a pigment in the
retina that enables vision in low-light conditions. Deficiency leads to impaired
dark adaptation and night blindness, and severe deficiency can progress to
xerophthalmia.
Question 6: Which mineral is a major component of hemoglobin and is essential
for oxygen transport?
,A. Calcium
B. Iron
C. Zinc
D. Magnesium
CORRECT ANSWER: B. Iron
Rationale: Iron is a central component of the heme group in hemoglobin, which
binds oxygen in the lungs and transports it to tissues. Iron deficiency leads to
microcytic hypochromic anemia and impaired oxygen delivery.
Question 7: Which condition is characterized by an inadequate intake of protein
and energy over a prolonged period?
A. Obesity
B. Marasmus
C. Kwashiorkor
D. Sarcopenia
CORRECT ANSWER: B. Marasmus
Rationale: Marasmus results from chronic, severe deficiency of both protein and
total energy, leading to marked muscle wasting, loss of subcutaneous fat, and
growth retardation. Kwashiorkor is primarily a protein deficiency with edema and
is distinct from marasmus.
Question 8: Which of the following is a rich dietary source of vitamin C?
A. Whole milk
B. Citrus fruits
C. Red meat
D. Refined grains
CORRECT ANSWER: B. Citrus fruits
Rationale: Citrus fruits such as oranges, lemons, and grapefruits are excellent
sources of vitamin C (ascorbic acid). Vitamin C is water-soluble and heat-labile, so
fresh fruits and vegetables are the most reliable dietary sources.
Question 9: Which nutrient serves as the primary fuel for the brain under
normal conditions?
, A. Protein
B. Glucose
C. Fatty acids
D. Ketone bodies
CORRECT ANSWER: B. Glucose
Rationale: Under normal physiological conditions, the brain relies almost
exclusively on glucose for energy. It consumes approximately 120 grams of
glucose daily. Ketone bodies can serve as an alternative fuel during prolonged
fasting or ketogenic states.
Question 10: Which vitamin is synthesized in the skin upon exposure to
ultraviolet B light?
A. Vitamin A
B. Vitamin C
C. Vitamin D
D. Vitamin K
CORRECT ANSWER: C. Vitamin D
Rationale: Vitamin D is synthesized endogenously when 7-dehydrocholesterol in
the skin is converted to cholecalciferol (vitamin D3) upon exposure to ultraviolet B
radiation. Dietary sources and supplementation are important when sun exposure
is inadequate.
Question 11: Which of the following is a water-soluble vitamin?
A. Vitamin A
B. Vitamin D
C. Vitamin E
D. Vitamin B6
CORRECT ANSWER: D. Vitamin B6
Rationale: Vitamin B6 (pyridoxine) is a water-soluble vitamin that must be
consumed regularly because it is not stored in significant amounts in the body.
Vitamins A, D, and E are fat-soluble vitamins stored in adipose tissue and the liver.
Question 12: What is the primary role of dietary fiber in the digestive system?
Approach 8th Edition by Grodner, Escott-Stump & Dorner Study Guide,
Nursing Nutrition Exam Prep, Practice Questions with Answers & Rationales,
Wellness Nutrition, Nutrient Metabolism, Carbohydrates, Fats, Proteins,
Vitamins, Minerals, Nutrition Assessment, Therapeutic Diets, Nutrition
Across the Life Span & Clinical Nutrition
Question 1: Which macronutrient provides the most concentrated source of
energy per gram?
A. Carbohydrate
B. Protein
C. Fat
D. Alcohol
CORRECT ANSWER: C. Fat
Rationale: Fat provides approximately 9 kcal per gram, whereas carbohydrate and
protein each provide approximately 4 kcal per gram. Alcohol provides
approximately 7 kcal per gram but is not classified as a macronutrient. Therefore,
fat is the most energy-dense macronutrient.
Question 2: Which organ is primarily responsible for the absorption of most
nutrients?
A. Stomach
B. Large intestine
C. Small intestine
D. Esophagus
CORRECT ANSWER: C. Small intestine
Rationale: The small intestine, particularly the jejunum and ileum, is the primary
site for the absorption of carbohydrates, proteins, fats, vitamins, and minerals.
The stomach primarily initiates digestion, while the large intestine mainly absorbs
water and electrolytes.
Question 3: Which enzyme begins the digestion of starch in the mouth?
A. Pepsin
B. Salivary amylase
,C. Lipase
D. Trypsin
CORRECT ANSWER: B. Salivary amylase
Rationale: Salivary amylase, also called ptyalin, is secreted by the salivary glands
and initiates the breakdown of starch into smaller polysaccharides and maltose in
the oral cavity. Pepsin and trypsin digest proteins, while lipase digests fats.
Question 4: Which nutrient is most important for building and repairing body
tissues?
A. Carbohydrate
B. Protein
C. Fat
D. Water
CORRECT ANSWER: B. Protein
Rationale: Protein is composed of amino acids that serve as the structural building
blocks for muscles, organs, skin, and other tissues. It is essential for tissue repair,
growth, and maintenance, particularly during illness, injury, and recovery.
Question 5: Which vitamin deficiency is most commonly associated with night
blindness?
A. Vitamin A
B. Vitamin B12
C. Vitamin C
D. Vitamin D
CORRECT ANSWER: A. Vitamin A
Rationale: Vitamin A is essential for the production of rhodopsin, a pigment in the
retina that enables vision in low-light conditions. Deficiency leads to impaired
dark adaptation and night blindness, and severe deficiency can progress to
xerophthalmia.
Question 6: Which mineral is a major component of hemoglobin and is essential
for oxygen transport?
,A. Calcium
B. Iron
C. Zinc
D. Magnesium
CORRECT ANSWER: B. Iron
Rationale: Iron is a central component of the heme group in hemoglobin, which
binds oxygen in the lungs and transports it to tissues. Iron deficiency leads to
microcytic hypochromic anemia and impaired oxygen delivery.
Question 7: Which condition is characterized by an inadequate intake of protein
and energy over a prolonged period?
A. Obesity
B. Marasmus
C. Kwashiorkor
D. Sarcopenia
CORRECT ANSWER: B. Marasmus
Rationale: Marasmus results from chronic, severe deficiency of both protein and
total energy, leading to marked muscle wasting, loss of subcutaneous fat, and
growth retardation. Kwashiorkor is primarily a protein deficiency with edema and
is distinct from marasmus.
Question 8: Which of the following is a rich dietary source of vitamin C?
A. Whole milk
B. Citrus fruits
C. Red meat
D. Refined grains
CORRECT ANSWER: B. Citrus fruits
Rationale: Citrus fruits such as oranges, lemons, and grapefruits are excellent
sources of vitamin C (ascorbic acid). Vitamin C is water-soluble and heat-labile, so
fresh fruits and vegetables are the most reliable dietary sources.
Question 9: Which nutrient serves as the primary fuel for the brain under
normal conditions?
, A. Protein
B. Glucose
C. Fatty acids
D. Ketone bodies
CORRECT ANSWER: B. Glucose
Rationale: Under normal physiological conditions, the brain relies almost
exclusively on glucose for energy. It consumes approximately 120 grams of
glucose daily. Ketone bodies can serve as an alternative fuel during prolonged
fasting or ketogenic states.
Question 10: Which vitamin is synthesized in the skin upon exposure to
ultraviolet B light?
A. Vitamin A
B. Vitamin C
C. Vitamin D
D. Vitamin K
CORRECT ANSWER: C. Vitamin D
Rationale: Vitamin D is synthesized endogenously when 7-dehydrocholesterol in
the skin is converted to cholecalciferol (vitamin D3) upon exposure to ultraviolet B
radiation. Dietary sources and supplementation are important when sun exposure
is inadequate.
Question 11: Which of the following is a water-soluble vitamin?
A. Vitamin A
B. Vitamin D
C. Vitamin E
D. Vitamin B6
CORRECT ANSWER: D. Vitamin B6
Rationale: Vitamin B6 (pyridoxine) is a water-soluble vitamin that must be
consumed regularly because it is not stored in significant amounts in the body.
Vitamins A, D, and E are fat-soluble vitamins stored in adipose tissue and the liver.
Question 12: What is the primary role of dietary fiber in the digestive system?
