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Understanding the Glycemic Index: What is it, and how can it help me be healthy? OK, we've heard all about it over the last two years, and it's used as an effective marketing tool. It's the latest trend in trying to get you to buy a brand of food instead of a competitor's. It's used a lot in children's food advertising. But just what is GI? And more importantly, how can we use the Glycemic Index to better choose healthier meals? Scientifically speaking, the Glycemic Index is a representation of how much energy is released to the bloodstream (in the form of blood sugar) over 2 hours. It's t...