I was told by someone who has
> researched this issue, that many wild (tropical) fruits do actually
contain
> high sugar content.

i have a sense that amount of sugar per se doesn't matter, what will be
important ( and this deducted from the experience of eating instinctively)
is the relationship with the mineral content of the fruit . a wildfruit will
be way richer in minerals ( tilling the ground , fertilising , monoculture
etc...create minerals unbalances  ).
also the relationship with the fiber content .
even if physiologically it could be compensated by eating more mineral rich
foods ( like wild greens ) the problem of necessiting higher quantity
intake of the depleted fruits to get satiated will means too much sugar
intake .
jean-claude