Seriously.
There is a hereditary version called HFI - Hereditary Fructose Intolerance.
And there is what is today called Fructose Malabsorption. - AND in Europe there are indications that as many as 45% of caucasians have FA - although only about half exhibit any symptoms.
Anyway, the Mayo Clinic is concerned that so few people have any understanding of Fructose Malabsorption - because IF it is the reason behind a persons IBS, even life long symptoms can disappear if one eats meat/fish and rice/potatoes/cornmeal for a week or so....
Last year at some point the American Dietic Association OR the American Journal of Nutrition --- some biggie ol' journal that all the professional dieticians subscribe to, did their ENTIRE ISSUE on FRUCTOSE --- because even the professionals are clueless as to its impact on susceptible individuals and it's strong association with gout & obesity & diabetes.
AND NO -- I mean FRUCTOSE, I'm not talking about the HFCS, although of course high fructose corn syrup becomes a "no no," too. I mean the fructose that almost everybody believes is "easy" to digest, and which dieticians USED to tell their diabetic clients to use in baking.
Have worked through the fructose thing~no problem. On the other hand, starch by itself is a problem ~ just not cut out for it.