In the 19 fifties, Ansel keys starts doing studies on dietary fat and heart disease. One of the main pieces of research that starts to solidify this idea that saturated fat is bad for you. It's only on 66 people, and it's these like skitsophrenic dudes. But in thelike, endlessly atrocious ethics of science at this time, he does a bunch of diet studies on only on men. The real cause of hert attacks is saturated fat and electro shock therapy.