What is the glycemic index? Rayne March 09, 2022 00:08 Updated Glycemic index is a relative ranking of the impact a food containing carbohydrates has on your blood sugar. As a tool, it may help you to stabilize your blood sugar. Related articles What is total cholesterol? Self-Pay | Website registration Are carbohydrates (or “carbs”) good or bad? What’s the healthiest diet? How will I be billed for my virtual nutrition visit?