Fructose (fruit & corn sugar) does not cause a rise in blood sugar like Sucrose (table sugar) so manufactures went crazy and started putting Hi-Fructose Corn Syrup (HFCS) in everything...with the blessing of the medical community. But here's the Coup d' Gras! HFCS is usually a mixture of 50% Corn Fructose & 50% Glucose ...Gee, that looks an awful lot like the Disaccaride Table Sugar mentioned above... Fructose + Glucose = Sucrose.
Granted, fructose alone does not cause the same rise in blood sugar, but it is still a simple sugar, which means it is an empty calorie with no vitamins, minerals or enzymes! But because of the low blood sugar rise, the "Fructose Crowd" tries to pass off a fructose carb as comparable to a complex veggie carb... ...they are, decidedly, not the same just because fructose acts sort of like a complex carb!
In fact, Fructose... even though it does not cause a large increase in blood sugar, still manages to reduce the affinity of insulin for its receptor, so if you are "genetically predisposed" then a little later down the road you will start getting an increase in insulin anyway, because the body has to secrete more to do the same job as before -- this is "Fructose-induced Insulin Resistance."
Because it is possible for a fat person to eat lots of fructose & sucrose without becoming Insulin Resistant, I will very reluctantly concede that a person might have to be genetically predisposed to develop Type II Diabetes... but if that's true, then there is a very large percentage of the population that is susceptible because "Adult On-set Diabetes" is increasing exponentially...