Question

Why does consuming glucose before exercise reduces the increase in plasma free fatty acid concentration more than fructose?

Answer 1

First off all, fructose needs four times more to be obtained by the organism than glucose. So basically, fructose has no time to act. Besides it, isomerical conformation mean a lot of for receptors, so glucose can bind with receptors specifically to lower the level of free fatty acids, but fructose is not. On a biological point of view, there is not a lot of information about it, but it may be evolutionary better, because glucose is included in numerous biochemical pathways, fructose not in same amount.