THE GLYCEMIC INDEX HAS BEEN AROUND for some 25 years, though its appeal has only recently grown beyond those who use it for medical reasons. The system was originally developed to help diabetics and others with carb-sensitive conditions more accurately monitor and control their blood glucose levels. More recently, low-carb dieters searching for a more sophisticated way to manage weight loss were attracted to the GI. Ditto the rise of long-distance athletics, where competitors were looking ...

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