The Glycemic Impact Diet is one of more popular diets to appear worldwide. The diet is based on the Glycemic Index - which has been around for some time. However, only recently have GI based diets become popular with the public. The Glycemic Impact Diet delves even further into the glycemic index by taking into account Glycemic Load. This is a combination of the glycemic index of a food and the amount of carbohydrate the food has.