It took me a while to understand that, but after having published dozens of books about diet and nutrition, and having read much more, I have reached the conclusion that our knowledge is still very limited.
The story of cholesterol is a perfect illustration. In the 50’s with Ancel Keys’ Seven Countries Study, America started to think that fat was a bad thing and a low-fat high carb diet began to be officially recommended.
War on fat
Gradually, the idea became mainstream and people started to remove fats from their diet, replaced saturated fat by unsaturated fat which means eating margarine instead of butter.
