There's more concern with artificial sweeteners than just glucose intolerance. They've also seen "thickening of the gut lining" -- it's demonstrable and a clear indication that SOMETHING is going on.
Likely there is an issue with stomach bacteria and an issue where the brain "tastes" sweet and thus primes the body for sweet.
I've moved to using Stevia as much as possible, because I don't look at artificial sweeteners as harmless. It seems that almost all artificial foods should be avoided. There's no point in margarine because butter is better (or use Coconut oil), preservatives hurt stomach bacteria and reduce digestion, a lot of Genetically Modified foods show tumor acceleration in rats and infertility in three generations, and what's next?
It seems to me that it's only a matter of time when we find the folly of artificial foods that are tested on the basis of "large quantities don't kill a rat" and the study was paid for by a billion dollar industry with a vested interest that can lobby government.
And I'm really sick of people in the Pro Science crowd chirping that Genetically Modified is just like cross breeding. The food we eat is so incredibly complex -- we barely have a clue about vitamins much less the macrobiotic processes. We barely understand transgenetic gene transfers that stands a lot of concepts of "Darwinist evolution" on its head and that's yet to sync into main stream thinking. Not all GM foods are alike and HOW the genes are transferred matter and YES, putting the genes of an animal in a tomato is something to pay close attention to.
The problem is we've let a profit-driven industry dictate a massive experiment on humankind -- and that's just nuts. The cells of the body are 90% bacteria -- and modern Western medicine barely acknowledges the role this colonial symbiosis plays on humanity.
It's amazing we haven't wiped ourselves out.