Comment by aldarion

Because they don't eat processed foods.

Also, red meat isn't a known carcinogen. Processed meat is. And plaque formation in arteries is a consequence of inflammation... which is caused by sugar, a.k.a. carbohydrates. Insulin resistance is also a consequence of increased carbohydrate consumption.

But as I said, it is a combination of fats and carbs that is the worst killed. Eliminating either one of those from the diet leads to an automatic improvement.