Q: Which of the following equations correctly represents the energy yield from 1 gram of fat?

$$9 \ \text{kcal} = 1 \ \text{g fat}$$

Question 1

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

Accepted Answer

Triglycerides contain three fatty acids and a glycerol backbone, while phospholipids contain two fatty acids, a glycerol backbone, and a phosphate group.

Question 2

A food manufacturer wants to increase the shelf life of a product high in unsaturated fats. Which process is most likely to be used, and what is a potential health consequence?

Accepted Answer

Hydrogenation; it increases trans fat content, which raises LDL and lowers HDL cholesterol.

Question 3

Which of the following equations correctly represents the energy yield from 1 gram of fat?

Accepted Answer

$$9 \ 	ext{kcal} = 1 \ 	ext{g fat}$$

Question 4

A patient is diagnosed with atherosclerosis. Which of the following best describes the initial step in the development of this condition?

Accepted Answer

Injury to the arterial lining promotes inflammation, attracting LDLs and other lipids to accumulate at the site.

Question 5

Which of the following dietary recommendations is most appropriate for reducing the risk of coronary heart disease?

Accepted Answer

Limit saturated fat to less than 10% of total kilocalories and trans fat to less than 1% of total kilocalories.

Question 6

Which lipoprotein is responsible for transporting cholesterol from the liver to the tissues, and why is it considered 'bad' cholesterol?

Accepted Answer

LDL; because it deposits cholesterol in the arteries, increasing the risk of atherosclerosis.

Question 7

Which of the following best explains why fats are a more concentrated source of energy than carbohydrates or proteins?

Accepted Answer

Fats have a higher ratio of carbon and hydrogen to oxygen, allowing for more energy release during oxidation.

Question 8

A person consumes a meal rich in long-chain fatty acids. Describe the absorption pathway these fatty acids follow after digestion.

Accepted Answer

They are packaged into chylomicrons, enter the lymphatic system, and then the bloodstream via the thoracic duct.

Question 9

Which of the following is a function of essential fatty acids in the body?

Accepted Answer

They are precursors for eicosanoids, which regulate blood clotting and inflammation.

Question 10

A patient is advised to increase their intake of omega-3 fatty acids. Which food would be the best recommendation?

Accepted Answer

Salmon

Question 11

Which of the following statements about cholesterol is correct?

Accepted Answer

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

Question 12

Which of the following best describes the role of bile in lipid digestion?

Accepted Answer

Bile emulsifies large fat droplets into smaller ones, increasing the surface area for pancreatic lipase action.

Question 13

Which of the following equations represents the Acceptable Macronutrient Distribution Range (AMDR) for fat intake?

Accepted Answer

$$20\% \leq 	ext{Fat kcal} \leq 35\% of $$total daily kilocalories

Question 14

Which of the following is a major difference between cis and trans unsaturated fatty acids?

Accepted Answer

Cis fatty acids have hydrogens on the same side of the double bond, while trans fatty acids have hydrogens on opposite sides.

Question 15

A person is following a diet high in myristic and palmitic acids. What is the likely effect on their blood lipid profile?

Accepted Answer

Increased LDL cholesterol levels

Question 16

Which of the following best explains why lecithin supplements are not necessary for health?

Accepted Answer

The liver synthesizes all the lecithin the body needs, and dietary lecithin is digested and not absorbed intact.

Question 17

Which of the following foods is highest in saturated fat and should be limited to reduce heart disease risk?

Accepted Answer

Fatty cuts of red meat

Question 18

Which of the following statements about plant sterols is correct?

Accepted Answer

Plant sterols lower LDL cholesterol by competing with cholesterol for absorption.

Question 19

A patient wants to lower their LDL cholesterol. Which combination of lifestyle changes would be most effective?

Accepted Answer

Increase exercise, consume more soluble fiber, and reduce intake of saturated and trans fats.

Lipids: Structure, Function, Digestion, and Health Implications

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