Criticism
The research of Ancel Keys has been criticized in peer-reviewed published literature and as well as popular, non-peer reviewed laymen books offering contrarian idea's about nutrition, health and lipid metabolism. In 1957 researchers Yerushalmy and Hilleboe using the same data-set which Keys had shown strong relationship between dietary fat and atherosclerosis, pointed out even stronger positive correlation between animal protein intake and incidence of coronary heart disease, although this relationship exists with sugar as well, but was ignored.
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