Fructose (was Sugar Consumption Post-Workout - Any Benefit?)

[Guest guest]

In a nutshell, fructose increases de novo lipogenesis.

The whole fructose pathway is made up of multiple pathways that result

in glucose, glycogen, VLDL, and Acetyl-CoA. The pathway I described

before results in glucose->ATP. I do not know of the percentages of

each end product. However, because fructose is converted to F6P, it

bypasses the rate-controlling step 6-phosphofructokinase (which

inhibits glucose metabolism). Because fructose metabolism is not

inhibited (keep in mind that metabolism does not necessarily mean

" burning for energy " , rather " processing for usage by the body " ),

there is much more Acetyl-CoA production from glycolysis. Since

Acetyl-CoA is a precursor for de novo lipogenesis, it would be wise to

assume that high fructose consumption will result in a greater fat

gain than an equal amount of glucose.

I think I went off on a tangent there, but I sure learned a lot from

that little research excursion. I need to cut back on that fruit!

-Nina

> Hi Nina,

>

> I'm just going off the top of my head here, but it sounds like the

> above mechanism is for burning fructose as energy, isn't it? The

> information I've read says that 60% or so is converted to glucose and

> eventually reaches the blood as glucose.

>

> Chris

> --

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