Glycemic Index (GI) Does glycemic index matter for diabetes? Glycemic index (GI) is simply a measurement of how long and how high a particular food makes your blood sugar level (BSL) rise. All carbohydrates are not created equal; some are converted into glucose rapidly and enter the bloodstream leading to quick spikes, whereas others work more slowly. What are high and low GI food... https://www.freedomfromdiabetes.org/blog/post/what-is-glycemic-index-complete-knowledge-about-gi/2666