NUTRITION SCIENCE EXAM with Questions and
Answers/Plus a Rationale Updated 2026 A+/Instant
Download PDF
EXAM COVERAGE
1. Macronutrient Metabolism and Energy Regulation
2. Micronutrient Functions, Deficiencies, and Toxicity
3. Digestion, Absorption, and Gastrointestinal Physiology
4. Nutritional Assessment and Life Cycle Requirements
5. Clinical Nutrition and Disease States
1. A clinical dietitian is evaluating a 45-year-old male with chronic alcoholism who presents with
confusion, ataxia, and ophthalmoplegia. Laboratory findings indicate severe malnutrition. Which
water-soluble vitamin deficiency is responsible for this acute neurological presentation?
A. Niacin (Vitamin B3)
B. Thiamine (Vitamin B1)
C. Pyridoxine (Vitamin B6)
D. Cobalamin (Vitamin B12)
CORRECT ANSWER : B
Rationale: Thiamine deficiency causes Wernicke-Korsakoff syndrome, characterized by the
classic triad of confusion, ataxia, and ophthalmoplegia, commonly precipitated by chronic
alcohol abuse which impairs thiamine absorption. Niacin deficiency causes pellagra, B6
deficiency causes peripheral neuropathy, and B12 deficiency results in megaloblastic anemia
and subacute combined degeneration.
2. A patient with Type 1 diabetes mellitus is admitted to the emergency department with fruity-
smelling breath, Kussmaul respirations, and a serum glucose of 520 mg/dL. Which metabolic
, pathway is excessively upregulated, leading to the accumulation of ketone bodies and metabolic
acidosis?
A. Glycogenesis
B. Ketogenesis via beta-oxidation of fatty acids
C. De novo lipogenesis
D. Pentose phosphate pathway
CORRECT ANSWER : B
Rationale: In the absence of insulin, hormone-sensitive lipase is disinhibited, resulting in
massive lipolysis and the release of free fatty acids into the bloodstream. These fatty acids
undergo excessive beta-oxidation in the liver, overwhelming the citric acid cycle and resulting in
accelerated ketogenesis and ketoacidosis.
3. During a routine prenatal visit, a 28-year-old primigravida at 8 weeks gestation is counseled on
the prevention of neural tube defects. Which micronutrient supplementation protocol is clinically
indicated?
A. Ascorbic acid 500 mg daily starting immediately
B. Folic acid 400 to 800 mcg daily prior to conception and through the first trimester
C. Retinol 10,000 IU daily throughout the gestational period
D. Ergocalciferol 50,000 IU weekly to prevent neonatal hypocalcemia
CORRECT ANSWER : B
Rationale: Adequate periconceptional intake of folic acid is critical for closing the neural tube
during early embryogenesis, typically recommended at 400 to 800 mcg daily. High-dose retinol
is teratogenic during pregnancy, and vitamin D or C protocols do not directly prevent neural
tube defects.
4. A 60-year-old female presents with severe bone pain, proximal muscle weakness, and bowed
legs. Laboratory studies reveal low serum 25-hydroxyvitamin D, low calcium, and elevated
parathyroid hormone (PTH). What is the definitive diagnosis?
A. Osteoporosis
B. Osteomalacia
C. Paget's disease of bone
, D. Osteogenesis imperfecta
CORRECT ANSWER : B
Rationale: Osteomalacia is characterized by defective mineralization of the organic bone matrix
due to vitamin D or calcium deficiency in adults, leading to bone pain and softening (bowing).
Osteoporosis involves loss of bone mass and structural integrity with normal mineralization
ratios, whereas Paget's disease involves focal areas of high bone turnover.
5. A researcher is measuring the biological value (BV) of various dietary protein sources. Which
food protein would yield the highest biological value due to its optimal balance of all essential
amino acids?
A. Wheat gluten
B. Pinto beans
C. Whole egg
D. Gelatin
CORRECT ANSWER : C
Rationale: Whole egg protein has the highest biological value and serves as the reference
standard for protein quality because it contains all essential amino acids in exact proportions
required by the human body. Plant proteins like beans and wheat are often limited in one or
more essential amino acids, lowering their BV.
6. An 11-month-old infant is brought to the pediatric clinic exhibiting delayed motor development,
apathy, pitting edema of the lower extremities, and a distended abdomen with a fatty liver. The
mother reports a recent diet consisting almost entirely of diluted cornstarch gruel following
weaning from breast milk. What form of malnutrition is this infant experiencing?
A. Marasmus
B. Kwashiorkor
C. Scurvy
D. Beriberi
CORRECT ANSWER : B
Rationale: Kwashiorkor is protein-energy malnutrition characterized by adequate total caloric
intake dominated by starchy carbohydrates but a severe deficiency in dietary protein,
Answers/Plus a Rationale Updated 2026 A+/Instant
Download PDF
EXAM COVERAGE
1. Macronutrient Metabolism and Energy Regulation
2. Micronutrient Functions, Deficiencies, and Toxicity
3. Digestion, Absorption, and Gastrointestinal Physiology
4. Nutritional Assessment and Life Cycle Requirements
5. Clinical Nutrition and Disease States
1. A clinical dietitian is evaluating a 45-year-old male with chronic alcoholism who presents with
confusion, ataxia, and ophthalmoplegia. Laboratory findings indicate severe malnutrition. Which
water-soluble vitamin deficiency is responsible for this acute neurological presentation?
A. Niacin (Vitamin B3)
B. Thiamine (Vitamin B1)
C. Pyridoxine (Vitamin B6)
D. Cobalamin (Vitamin B12)
CORRECT ANSWER : B
Rationale: Thiamine deficiency causes Wernicke-Korsakoff syndrome, characterized by the
classic triad of confusion, ataxia, and ophthalmoplegia, commonly precipitated by chronic
alcohol abuse which impairs thiamine absorption. Niacin deficiency causes pellagra, B6
deficiency causes peripheral neuropathy, and B12 deficiency results in megaloblastic anemia
and subacute combined degeneration.
2. A patient with Type 1 diabetes mellitus is admitted to the emergency department with fruity-
smelling breath, Kussmaul respirations, and a serum glucose of 520 mg/dL. Which metabolic
, pathway is excessively upregulated, leading to the accumulation of ketone bodies and metabolic
acidosis?
A. Glycogenesis
B. Ketogenesis via beta-oxidation of fatty acids
C. De novo lipogenesis
D. Pentose phosphate pathway
CORRECT ANSWER : B
Rationale: In the absence of insulin, hormone-sensitive lipase is disinhibited, resulting in
massive lipolysis and the release of free fatty acids into the bloodstream. These fatty acids
undergo excessive beta-oxidation in the liver, overwhelming the citric acid cycle and resulting in
accelerated ketogenesis and ketoacidosis.
3. During a routine prenatal visit, a 28-year-old primigravida at 8 weeks gestation is counseled on
the prevention of neural tube defects. Which micronutrient supplementation protocol is clinically
indicated?
A. Ascorbic acid 500 mg daily starting immediately
B. Folic acid 400 to 800 mcg daily prior to conception and through the first trimester
C. Retinol 10,000 IU daily throughout the gestational period
D. Ergocalciferol 50,000 IU weekly to prevent neonatal hypocalcemia
CORRECT ANSWER : B
Rationale: Adequate periconceptional intake of folic acid is critical for closing the neural tube
during early embryogenesis, typically recommended at 400 to 800 mcg daily. High-dose retinol
is teratogenic during pregnancy, and vitamin D or C protocols do not directly prevent neural
tube defects.
4. A 60-year-old female presents with severe bone pain, proximal muscle weakness, and bowed
legs. Laboratory studies reveal low serum 25-hydroxyvitamin D, low calcium, and elevated
parathyroid hormone (PTH). What is the definitive diagnosis?
A. Osteoporosis
B. Osteomalacia
C. Paget's disease of bone
, D. Osteogenesis imperfecta
CORRECT ANSWER : B
Rationale: Osteomalacia is characterized by defective mineralization of the organic bone matrix
due to vitamin D or calcium deficiency in adults, leading to bone pain and softening (bowing).
Osteoporosis involves loss of bone mass and structural integrity with normal mineralization
ratios, whereas Paget's disease involves focal areas of high bone turnover.
5. A researcher is measuring the biological value (BV) of various dietary protein sources. Which
food protein would yield the highest biological value due to its optimal balance of all essential
amino acids?
A. Wheat gluten
B. Pinto beans
C. Whole egg
D. Gelatin
CORRECT ANSWER : C
Rationale: Whole egg protein has the highest biological value and serves as the reference
standard for protein quality because it contains all essential amino acids in exact proportions
required by the human body. Plant proteins like beans and wheat are often limited in one or
more essential amino acids, lowering their BV.
6. An 11-month-old infant is brought to the pediatric clinic exhibiting delayed motor development,
apathy, pitting edema of the lower extremities, and a distended abdomen with a fatty liver. The
mother reports a recent diet consisting almost entirely of diluted cornstarch gruel following
weaning from breast milk. What form of malnutrition is this infant experiencing?
A. Marasmus
B. Kwashiorkor
C. Scurvy
D. Beriberi
CORRECT ANSWER : B
Rationale: Kwashiorkor is protein-energy malnutrition characterized by adequate total caloric
intake dominated by starchy carbohydrates but a severe deficiency in dietary protein,
