Q: Which of the following equations correctly represents the calculation for Body Mass Index (BMI)?

$$\text{BMI} = \frac{\text{weight (kg)}}{\text{height (m)}^2}$$

Question 1

Which of the following statements best describes the difference between fat-soluble and water-soluble vitamins in terms of absorption and storage?

Accepted Answer

Fat-soluble vitamins are absorbed with dietary fat, transported via chylomicrons, and stored in the liver and adipose tissue, while water-soluble vitamins are absorbed directly into the bloodstream and are not extensively stored.

Question 2

A patient presents with bone pain and muscle weakness. Laboratory tests reveal low serum calcium and vitamin D levels. Which of the following best explains the role of vitamin D in calcium homeostasis?

Accepted Answer

Vitamin D enhances intestinal absorption of calcium by increasing the synthesis of calcium-binding proteins.

Question 3

Which of the following vitamins is synthesized by intestinal bacteria and is essential for blood clotting?

Accepted Answer

Vitamin K

Question 4

A 55-year-old woman is prescribed warfarin (Coumadin) after a heart valve replacement. Which vitamin should she monitor in her diet due to its interaction with her medication?

Accepted Answer

Vitamin K

Question 5

Which of the following best describes the concept of bioavailability as it relates to vitamins and minerals?

Accepted Answer

The proportion of a nutrient that is absorbed and utilized by the body.

Question 6

A patient with a history of alcoholism presents with confusion, ataxia, and ophthalmoplegia. Which vitamin deficiency is most likely responsible for these symptoms?

Accepted Answer

Vitamin B1 (thiamin)

Question 7

Which of the following minerals is the most abundant in the human body and plays a critical role in bone structure and muscle contraction?

Accepted Answer

Calcium

Question 8

A vegetarian is at increased risk for which type of anemia due to decreased intake of animal products, and what is the underlying cause?

Accepted Answer

Iron-deficiency anemia due to low intake of heme iron

Question 9

Which of the following best explains why excessive intake of vitamin A can be toxic, while excessive intake of beta-carotene is generally not?

Accepted Answer

Beta-carotene is converted to vitamin A only as needed, preventing toxicity, while preformed vitamin A can accumulate to toxic levels.

Question 10

A patient presents with fatigue, pallor, and spoon-shaped nails. Laboratory tests reveal microcytic, hypochromic red blood cells. Which mineral deficiency is most likely responsible?

Accepted Answer

Iron

Question 11

Which of the following equations correctly represents the calculation for Body Mass Index (BMI)?

Accepted Answer

$$	ext{BMI} = \frac{	ext{weight (kg)}}{	ext{height (m)}^2}$$

Question 12

Which water-soluble vitamin is essential for collagen synthesis and acts as an antioxidant?

Accepted Answer

Vitamin C

Question 13

A patient is diagnosed with pellagra, presenting with dermatitis, diarrhea, dementia, and eventually death. Which vitamin deficiency is responsible, and what is the precursor amino acid for its synthesis?

Accepted Answer

Niacin deficiency; tryptophan

Question 14

Which mineral is a component of the antioxidant enzyme glutathione peroxidase and is associated with Keshan disease when deficient?

Accepted Answer

Selenium

Question 15

A 30-year-old woman is pregnant and advised to increase her intake of a specific B vitamin to prevent neural tube defects in her baby. Which vitamin is this, and what is the recommended dietary allowance (RDA) for pregnant women?

Accepted Answer

Folate; 600 $$\mug/$$day

Question 16

Which of the following best describes the role of parathyroid hormone (PTH) in calcium regulation?

Accepted Answer

PTH increases blood calcium by stimulating bone resorption, increasing intestinal absorption (via vitamin D activation), and reducing renal excretion.

Question 17

Which of the following statements about iron absorption is correct?

Accepted Answer

Vitamin C enhances the absorption of non-heme iron.

Question 18

A patient with a genetic disorder accumulates copper in the liver, brain, and eyes, leading to neurological symptoms and Kayser-Fleischer rings. What is the most likely diagnosis?

Accepted Answer

Wilson's disease

Question 19

Which of the following best explains why calcium supplements should not be taken with iron supplements?

Accepted Answer

Calcium competes with iron for absorption in the intestine, reducing iron bioavailability.

Question 20

A patient presents with goiter and hypothyroidism. Which trace mineral deficiency is most likely responsible, and what is the active form of the thyroid hormone?

Accepted Answer

Iodine deficiency; T3 (triiodothyronine)

Vitamins and Minerals: Functions, Sources, and Deficiencies

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