Fraser et al1 have not shown that eating nuts protects vegetarians from heart attacks.
Vegetarians are not supposed to eat meat, so they meet their needs for protein by eating dairy products, eggs, nuts, and beans. Whole-milk dairy products and eggs contain lots of saturated fat and cholesterol, the two dietary components that increase the blood cholesterol level and susceptibility to heart attacks more than any other food components. Therefore, vegetarians who restrict dairy products and eggs have to get their protein from nuts and beans, both of which are very low in saturated fat and devoid of cholesterol. So, it seems to me that the article by Fraser et al showed that restricting whole-milk dairy products and eggs prevents heart attacks.
Mirkin G. Nuts Do Not Prevent Heart Attacks. Arch Intern Med. 1993;153(1):125. doi:10.1001/archinte.1993.00410010143018
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