Is There a Negative Effect of Insulin on Diabetes?

John Speakman's theory is that when humans were no longer subjected to predation threat, then we the genes that kind of kept our weights under control stopped acting on them. So there are certain people in the population in a certain amount of genes that stopped needing to necessarily keep us lean. And yeah, there might be some positive benefit for obesity genes and some natural ancestral environments. Some people want to eat more.