Q: A nutrition label states that a food contains 9 grams of fat, 4 grams of protein, and 12 grams of carbohydrate per serving. Calculate the total energy content per serving in kilocalories ($kcal$). Use the following values: $1g$ fat = $9$ $kcal$, $1g$ protein = $4$ $kcal$, $1g$ carbohydrate = $4$ $kcal$.

$(9 \times 9) + (4 \times 4) + (12 \times 4) = 81 + 16 + 48 = 145$ $kcal$

Question 1

Which of the following best describes the primary function of dietary fiber in human nutrition?

Accepted Answer

It promotes digestive health by increasing stool bulk and supporting regular bowel movements.

Question 2

A patient is advised to increase their intake of unsaturated fats. Which of the following foods would best help them achieve this goal?

Accepted Answer

Olive oil

Question 3

Which of the following statements about water-soluble vitamins is correct?

Accepted Answer

They are easily excreted in urine and must be consumed regularly.

Question 4

A 30-year-old woman is concerned about her bone health. Which nutrient is most directly involved in bone mineralization and should be emphasized in her diet?

Accepted Answer

Calcium

Question 5

Which of the following best explains why carbohydrates are considered the preferred fuel source for the brain?

Accepted Answer

The brain relies primarily on glucose, which is derived from carbohydrates, for energy.

Question 6

A nutrition label states that a food contains 9 grams of fat, 4 grams of protein, and 12 grams of carbohydrate per serving. Calculate the total energy content per serving in kilocalories ($kcal$). Use the following values: $1g$ fat = $9$ $kcal$, $1g$ protein = $4$ $kcal$, $1g$ carbohydrate = $4$ $kcal$.

Accepted Answer

$(9 	imes 9) + (4 	imes 4) + (12 	imes 4) = 81 + 16 + 48 = 145$ $kcal$

Question 7

Which of the following is a function of the large intestine in human digestion?

Accepted Answer

Absorption of water and electrolytes, and formation of feces

Question 8

A patient presents with symptoms of fatigue, pale skin, and shortness of breath. Blood tests reveal low hemoglobin levels. Which nutrient deficiency is most likely responsible for these symptoms?

Accepted Answer

Iron

Question 9

Which of the following best describes the process of passive diffusion in nutrient absorption?

Accepted Answer

Nutrients move from an area of higher concentration to lower concentration without the use of energy.

Question 10

Which of the following statements about water in the human body is correct?

Accepted Answer

Water acts as a solvent, lubricant, and medium for chemical reactions.

Question 11

A person consumes a meal high in saturated fat. Which of the following is a potential health risk associated with excessive intake of saturated fats?

Accepted Answer

Increased risk of cardiovascular disease

Question 12

Which of the following best explains why vitamin C is considered an essential nutrient?

Accepted Answer

It is required for collagen synthesis and must be obtained from the diet.

Question 13

A patient is diagnosed with a deficiency in vitamin B12. Which of the following symptoms is most likely to be observed?

Accepted Answer

Megaloblastic anemia

Question 14

Which of the following best describes the role of the TCA cycle (Krebs cycle) in metabolism?

Accepted Answer

It generates ATP by oxidizing acetyl-CoA derived from carbohydrates, fats, and proteins.

Question 15

A 25-year-old athlete is concerned about dehydration during intense exercise. Which of the following is the best indicator that he is adequately hydrated?

Accepted Answer

His urine is pale yellow in color.

Question 16

Which of the following is a major function of vitamin D in the body?

Accepted Answer

Promoting calcium absorption and bone health

Question 17

A food contains 10 grams of carbohydrate, 5 grams of protein, and 2 grams of fat. Calculate the percentage of total calories that come from fat. Use $1g$ carbohydrate = $4$ $kcal$, $1g$ protein = $4$ $kcal$, $1g$ fat = $9$ $kcal$.

Accepted Answer

$	ext{Total kcal} = (10 	imes 4) + (5 	imes 4) + (2 	imes 9) = 40 + 20 + 18 = 78$ $kcal$; $	ext{Fat kcal} = 18$; $\frac{18}{78} 	imes 100 \approx 23\%$

Question 18

Which of the following best describes the difference between fat-soluble and water-soluble vitamins?

Accepted Answer

Fat-soluble vitamins are stored in the liver and adipose tissue, while water-soluble vitamins are not stored in significant amounts.

Question 19

A patient is experiencing muscle cramps and irregular heartbeat. Which mineral deficiency is most likely responsible for these symptoms?

Accepted Answer

Potassium

Question 20

Which of the following is a function of the gut microbiota in human health?

Accepted Answer

Synthesis of certain vitamins such as vitamin K and some B vitamins

Comprehensive Study Notes: Nutrition Fundamentals, Carbohydrates, Lipids, Vitamins, and Water

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