Vegans have a lower risk of heart disease. This may be because of their high intake of:

Question

BlackTom AI · Accepted Answer

High dietary fiber intake—especially soluble fiber—is a major reason vegans have a lower risk of heart disease.

1. Relevant knowledge points and concepts
- Soluble fiber (found in oats, beans, lentils, fruits) binds bile acids and cholesterol in the gut and is fermented to short-chain fatty acids (SCFAs) that reduce hepatic cholesterol synthesis. This lowers LDL cholesterol, a primary risk factor for atherosclerotic heart disease.  
- Plant-based diets tend to be low in saturated fat and cholesterol and high in fiber, antioxidants, and phytosterols, all of which favorably affect blood lipids, blood pressure, inflammation, and body weight.

2. Step-by-step reasoning
- Vegans consume more whole plant foods, which increases intake of soluble and insoluble fiber.  
- Soluble fiber forms a viscous gel in the intestine, trapping bile acids and dietary cholesterol.  
- Bound bile acids are excreted rather than reabsorbed; the liver must use circulating cholesterol to synthesize new bile acids, reducing serum LDL.  
- Fermentation of fiber by colonic bacteria produces SCFAs (e.g., propionate) that inhibit cholesterol synthesis in the liver, further reducing LDL.  
- Lower LDL and improved metabolic profiles translate into reduced atherosclerosis and heart disease risk.

3. Intermediate steps / mechanisms (no numeric calculation needed)
- Intake → gut binding of bile/cholesterol → increased excretion → increased hepatic conversion of cholesterol to bile acids → lower plasma LDL.  
- Fermentation → SCFAs → decreased HMG-CoA reductase activity → reduced endogenous cholesterol production.

4. Why the correct answer is correct
- Fiber directly lowers LDL cholesterol and improves other cardiometabolic risk factors; this biological pathway explains the observed lower heart disease risk in vegans.

5. Why other options are incorrect
- Fish: contains omega-3s beneficial for heart health, but vegans do not consume fish; it is not a characteristic high intake of vegan diets.  
- Red meat: associated with higher saturated fat and increased heart disease risk, not lower.  
- Saturated fat: raises LDL cholesterol and increases heart disease risk; vegans typically consume less saturated fat.

6. Conclusion
These mechanisms show that fiber is the most plausible protective dietary component; this confirms the correct answer: fiber.

Vegans have a lower risk of heart disease. This may be because of their high intake of:单项选择题

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