Fats are important in the diet because

Question

BlackTom AI · Accepted Answer

Fats provide concentrated energy (9 kcal per gram), carry fat‑soluble vitamins, and participate in many regulatory and structural functions in the body, so the correct choice is d. all of the above.

1. Relevant knowledge points and concepts
- Energy density: dietary fat yields about 9 kilocalories (kcal) per gram, versus ~4 kcal/g for carbohydrates and proteins.  
- Fat‑soluble vitamins: vitamins A, D, E, and K require dietary fats for absorption and transport.  
- Regulatory and structural roles: fats form cell membranes (phospholipids), provide thermal insulation and cushioning, are precursors for hormones and signaling molecules (e.g., steroid hormones, prostaglandins), and essential fatty acids (omega‑3 and omega‑6) are necessary for normal physiology.

2. Step‑by‑step reasoning
- Option (a): fats supply food energy — true because of their 9 kcal/g energy content.  
- Option (b): fats help carry certain vitamins — true because A, D, E, K are fat‑soluble and require dietary fat for proper absorption.  
- Option (c): fats help regulate body functions — true because fats and their derivatives regulate inflammation, blood clotting, cellular signaling, hormone synthesis, and provide structural components of cells.  
- Since (a), (b) and (c) are all true, the combined statement (d) “all of the above” is correct. Option (e) is incorrect.

3. Calculations (intermediate steps)
- Energy comparison: 1 g fat = 9 kcal. Example: 20 g fat × 9 kcal/g = 180 kcal.  
- Dietary example: on a 2,000 kcal diet, if 30% of calories come from fat: 0.30 × 2000 = 600 kcal from fat → 600 kcal ÷ 9 kcal/g = ~66.7 g fat per day.

4. Why the correct answer is correct
- Each individual statement (a–c) accurately describes an established role of dietary fats; therefore the inclusive choice “all of the above” correctly summarizes fats’ importance.

5. Why other options are incorrect
- (a), (b), (c) are each true but incomplete when considered alone.  
- (e) is false because fats are not inherently harmful and are essential; only excessive intake of certain types (e.g., trans fats, excessive saturated fats) can be unhealthy.

6. Conclusion
- Combining the factual roles above confirms the correct answer is d. all of the above, which matches the provided answer.

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