Really, hunter-gatherer tribes eat 60% of their calories in refined sugars? Or are you conflating any form of sugar (specifically in fruit) and refined sugars such as in soft drinks?
I forgot their names but there are 3 main tribes that I remember being studied. Two of them ate significant amounts of honey and a third traded for refined white sugar.
>Honey represents a substantial portion of the Hadza diet (~10-20% of calories)
There is another tribe that will eat up to 60% of their calories from honey depending on the availability of food.
Another tribe trades with first-world countries for white sugar.
In that paper they also reference the Mbuti pygmies of the Congo. Specifically: "The Mbuti of the Congo forests eat large amounts of honey. According to Ichikawa (1981), honey is their favorite food. At times, during the rainy season up to 80% of the calories in their diet come from honey."