FWIH The secret is in the legs. The more muscle in your legs, the more regulated your sugar.
That makes sense to me. When figuring what is good for the body, think of how our ancestors evolved going back over a million years. Those genes get passed on. They survived by walking many miles everyday in search of food. Agriculture is only 15,000 years or old. Before that it was a nomadic life. They ate fruits, berries, root vegetables and whatever animal they could kill for food which had to be sporadic with no guns nor bows and arrows.