Glycemic Index Diet: Improve Health, Using the Glycemic Index Guide, With Delicious Glycemic Index Recipes A lot of people are talking about the low glycemic index diet, but what are glycemic index diets, anyway? If you've done any research on the topic, it's understandable that you may have come away with the idea that a glycemic index diet plan is too complicated to be a realistic option for the average person. Fortunately, that's not the case at all. What is the glycemic index diet? It's actually a lot simpler than many people would have you believe. Essentially, it's a diet which minimizes or eliminates foods which are high on the glycemic index while emphasizing foods low on the glycemic index like fresh vegetables, fruits and whole grains.