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 fats, travel with protein carriers, and are stored in the liver or fatty tissues, while water-soluble vitamins are absorbed directly into the blood and are not stored in the body.

Question 2

A patient presents with night blindness and dry, cracked skin. Which vitamin deficiency is most likely responsible, and what is a key food source to recommend?

Accepted Answer

Vitamin A deficiency; recommend liver or fortified milk.

Question 3

Which of the following is a symptom of excess beta-carotene intake, and why is it not considered toxic?

Accepted Answer

Skin discoloration; because excess beta-carotene accumulates in the fat layer under the skin but does not cause organ damage.

Question 4

A child with bowed legs and beaded ribs is most likely suffering from which condition, and what is the underlying nutrient deficiency?

Accepted Answer

Rickets; vitamin D deficiency

Question 5

Which of the following best explains why vitamin D toxicity is dangerous?

Accepted Answer

It increases blood calcium concentrations, leading to calcification of soft tissues such as the kidneys and heart.

Question 6

A patient is taking warfarin (an anticoagulant) and is advised to monitor their intake of which vitamin due to its role in blood clotting?

Accepted Answer

Vitamin K

Question 7

Which of the following is a primary antioxidant vitamin, and what is its main function?

Accepted Answer

Vitamin E; protects cell membranes from oxidative damage by free radicals

Question 8

A person with a diet very low in fat is at risk for deficiencies in which group of vitamins, and why?

Accepted Answer

Fat-soluble vitamins (A, D, E, K); because they are absorbed with dietary fat

Question 9

Calculate the maximum daily intake of vitamin A (in micrograms) that should not be exceeded to avoid toxicity, according to the Tolerable Upper Intake Level (UL).

Accepted Answer

$$ 3,000 \, \mu g $$

Question 10

Which of the following scenarios increases the risk of vitamin D deficiency, and why?

Accepted Answer

Wearing sunscreen and living above 40 degrees latitude; because less UV exposure reduces skin synthesis of vitamin D

Question 11

Which vitamin is synthesized by intestinal bacteria, and why are newborns at risk for deficiency?

Accepted Answer

Vitamin K; because they are born with a sterile intestinal tract

Question 12

A patient presents with symptoms of anemia due to red blood cell rupture. Which vitamin toxicity could be responsible, and what is the mechanism?

Accepted Answer

Vitamin K toxicity; causes bilirubin to spill into circulation, leading to jaundice and red blood cell rupture

Question 13

Which of the following foods is the richest source of active vitamin A?

Accepted Answer

Liver

Question 14

A smoker may have increased needs for which vitamin, and what is the rationale?

Accepted Answer

Vitamin E; because oxidative stress from smoking increases the need for antioxidants

Question 15

Which of the following best describes the role of vitamin D in calcium regulation?

Accepted Answer

Vitamin D acts at the skeleton, digestive tract, and kidneys to increase blood calcium levels.

Question 16

A patient is experiencing loss of muscle coordination, impaired vision, and speech. Which vitamin deficiency is most likely, and what is a common cause?

Accepted Answer

Vitamin E deficiency; due to fat malabsorption

Question 17

Which of the following is a correct recommendation for vitamin D intake for adults aged 71 and older?

Accepted Answer

$$ 20 \, \mu g / 	ext{day}  (800 IU)$$

Question 18

Which of the following best explains why vitamin E is crucial for lung health?

Accepted Answer

It protects red blood cells from oxidative damage during oxygen transport.

Question 19

A patient is taking both vitamin E supplements and anticoagulant medication. What is a potential risk, and why?

Accepted Answer

Increased risk of uncontrolled bleeding; because vitamin E can increase blood clotting time.

Fat-Soluble and Water-Soluble Vitamins: Characteristics, Functions, Deficiency, and Toxicity

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