Quote:
Originally Posted by Freak  1. Fructose post workout will replenish your liver glycogen and not your muscle glycogen. 2/3 of your glycogen is stored in your muscles.
2. Many fruits are low-med gi (glycemic index) due to fiber in fruits. (Not to discount the fact that if you ate enough grams it would significantly raise your blood sugar.. it's just another reason why it is not optimal.
3. Fructose is absorbed using facilitated diffusion while sucrose and glucose use active transport. |
Do you have a scientific reference for this information?
I'm not trying to be difficult, but I have been doing a lot of research on carbohydrates lately and I have seen nothing to indicate that fructose would not replace muscle glycogen.
Personally, I choose dextrose over fructose post-workout, mainly for two reasons: Dextrose basically is glucose and does not require conversion; and it is only half as sweet as fructose. (Anyone who as tried has swallow a fructose-laden post-workout drink would know what I mean.)
I welcome any information that would further explain your point about muscle glycogen replacement.
An update:
I love being urged to do the research. Reviewing the information in Wikipedia (Siting reserved until 15 posts are made.), I found the following:
"Unlike glucose, fructose is almost entirely metabolized in the liver. When fructose reaches the liver, says Dr. William J. Whelan, a biochemist at the University of Miami School of Medicine, "the liver goes bananas and stops everything else to metabolize the fructose." Eating fructose as compared to glucose results in lower circulating insulin levels, leptin, and ghrelin levels postprandially. These hormones are implicated in the control of appetite and satiety, and it is hypothesized that eating lots of fructose could increase the likelihood of weight gain."
Whether or not fructose is utilized in the muscle, I still don't know. However, lowering insulin is absolutely not what I want my post-workout drink to do.
