Q: Calculate the percentage of calories from fat in a meal containing 30 grams of fat and 600 total kilocalories. Use the formula $$\text{Percent calories from fat} = \frac{\text{grams of fat} \times 9}{\text{total kilocalories}} \times 100.$$

$$\frac{30 \times 9}{600} \times 100 = 45\%$$

Question 1

Which of the following statements best describes the structural difference between triglycerides and phospholipids?

Accepted Answer

Triglycerides have three fatty acids attached to a glycerol backbone, while phospholipids have two fatty acids and a phosphate group attached to a glycerol backbone.

Question 2

Which of the following best explains why unsaturated fatty acids are typically liquid at room temperature?

Accepted Answer

The presence of double bonds creates kinks in the fatty acid chains, preventing tight packing.

Question 3

A food manufacturer wants to increase the shelf life of a product containing unsaturated fats. Which process is most likely to be used, and what is a potential health risk associated with it?

Accepted Answer

Hydrogenation; it creates trans fats which increase the risk of heart disease.

Question 4

Which of the following is a function of cholesterol in the human body?

Accepted Answer

It is a precursor for vitamin D, sex hormones, and bile acids.

Question 5

Calculate the percentage of calories from fat in a meal containing 30 grams of fat and 600 total kilocalories. Use the formula $$	ext{Percent calories from fat} = \frac{	ext{grams of fat} 	imes 9}{	ext{total kilocalories}} 	imes 100.$$

Accepted Answer

$$\frac{30 	imes 9}{600} 	imes 100 = 45\%$$

Question 6

Which lipoprotein is responsible for transporting cholesterol from the liver to body tissues and is associated with increased risk of atherosclerosis when elevated?

Accepted Answer

Low-density lipoprotein (LDL)

Question 7

A patient has a blood LDL cholesterol level of 170 mg/dL. According to the National Cholesterol Education Program, how should this value be interpreted?

Accepted Answer

High

Question 8

Which dietary change is most effective in lowering LDL cholesterol levels?

Accepted Answer

Increasing intake of soluble fiber

Question 9

Which of the following best describes the process of lipid digestion and absorption in the small intestine?

Accepted Answer

Bile acids emulsify fat droplets, pancreatic lipase digests them, and micelles transport the products to the intestinal wall.

Question 10

Which of the following foods is considered a good source of omega-3 fatty acids?

Accepted Answer

Walnuts

Question 11

A person consumes a diet high in trans fats. Which of the following is a likely consequence?

Accepted Answer

Increased risk of coronary heart disease

Question 12

Which of the following statements about essential fatty acids is correct?

Accepted Answer

They must be obtained from the diet because the body cannot synthesize them.

Question 13

Which of the following best explains why foods high in unsaturated fats become rancid more quickly than those high in saturated fats?

Accepted Answer

Double bonds in unsaturated fats are less stable and more prone to oxidation.

Question 14

Which of the following is NOT a function of lipids in the body?

Accepted Answer

Transporting oxygen in the blood

Question 15

A patient is trying to reduce their risk of atherosclerosis. Which combination of lifestyle changes would be most effective?

Accepted Answer

Increase exercise, consume more soluble fiber, and quit smoking

Question 16

Which of the following statements about chylomicrons is correct?

Accepted Answer

They transport dietary lipids from the intestine through the lymphatic system to the bloodstream.

Question 17

Which of the following best describes the role of HDL in cardiovascular health?

Accepted Answer

HDL carries cholesterol from the cells to the liver for excretion, reducing the risk of heart disease.

Question 18

Which of the following is a recommended strategy to decrease excess LDL cholesterol according to the National Cholesterol Education Program?

Accepted Answer

Consume less saturated fat and more foods rich in soluble fiber.

Question 19

Which of the following statements about the absorption of fatty acids is correct?

Accepted Answer

Short- and medium-chain fatty acids are absorbed directly into the bloodstream, while long-chain fatty acids are packaged into chylomicrons.

Lipids: Structure, Function, Digestion, and Health Implications

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