So, where societies have very limited carbohydrate intake the people are generally skinny, like the Massai in Africa or the bedoins in the middle east deserts. Those folks are darn near anorexic. Now look at the tubs of flesh visiting the local Walmarts in America. How are they so different? Well, American diet is strongly centered around carbs whereas the hinterland of the world live on animals. It doesn't take a rocket scientist to figure out that Americans retain carbs as excess weight and since the Massai don't eat nearly as many carbs as Americans , they are painfully skinny.