This Is Your Brain On Sugar: Study in Rats Shows High-Fructose Diet Sabotages Learning, Memory

[intaglio]

13. Why do you need a lesson in digestion?

If there is fructose malabsorbtion then the fructose is not completely absorbed by the intestine, however sucrase tends to convert sucrose to glucose and L-fructose as are most sugars produced by plants. Unfortunately the absorbtion of D-fructose is considered to be slower as the pathways through the intestinal wall show preference for L- sugars because that is what they evolved to deal with. Thus HFCS's will tend to exacerbate the malabsorbtion problems. Metabolism is not the problem absorbtion is - nice try though.

You may not remember but D- sugars were marketed back in the 80's/early 90's as "low calorie sweeteners". Unfortunately they were largely withdrawn due to problems with flatulence and IBS as well as not actually being low calorie.