>> there are hunter-gatherer tribes living today that consume a significant amount of sugar (up to 60% of their calories) and don't have the same problems with

>> there are hunter-gatherer tribes living today that consume a significant amount of sugar (up to 60% of their calories) and don't have the same problems with obesity, diabetes, The reason they don't have those issues is they are constantly burning calories and in constant motion. H/G is not an easy life and those tribes (both men and women) put in a ton of manual labor. In college I remember one film where a tribe in Papua New Guinea were shown climbing a 15ft tall palm tree. All three males they showed were totally shredded. Six pack, lean upper bodies, biceps and legs were all cut. I would imagine the sugar gets burned up pretty quickly and it not only a source of calories but a primary source of energy - which is needed for how they live.