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Jason
10-13-2006, 10:10 AM
Why are grapes and-or grape juice used and recommended so commonly as post-workout glycogen replenishers?

Robb Wolf
10-13-2006, 10:28 AM
Great question!

Most of the sugar in fruit is either glucose or fructose. Glucose replenishes muscle glycogen whereas fructose preferentially replenishes LIVER glycogen. Once liver glycogen is topped-off any extra fructose is converted to fat. High fructose consumption deranges liver function and causes insulin resistance.

So when we eat a post workout meal we would like most the carbs to be in a form that replenishes muscle glycogen. This is one of those paradoxes of nutrition. High glycemic index fruits, like grapes, have less fructose…and are likely a better option for consistent consumption. Here a re a few interesting links on the topic.

http://www.askdrsears.com/html/4/T042600.asp
http://allergyadvisor.com/Educational/sept2002_2.htm