At least I think nobody advises to increase intake of sugar? Maybe just reducing sugar gets you 99% of the way...<p>The thing about humans is, they manage to live in all sorts of environments. I think the Inuit have no access to vegetables at all, meat only? But other societies probably don&#x27;t eat meat at all (for example some castes in India, afaik). So I suspect the human digestive system is actually very adaptive.<p>Problems may start if you try to manipulate the signals the digestive system reacts to, as is happening with industrialized, processed food. If you lie to the system, it can not (always) react in a healthy way. (That&#x27;s my guess, anyway).<p>On the other hand, comparing different societies might yield some valid insights? If a whole country doesn&#x27;t eat certain foods? Or what about the result that general health declined with the advent of agriculture?