The glycemic index (GI) measures how quickly carbohydrate-containing foods raise blood glucose levels. Foods are ranked on a scale from 0 to 100; high-GI foods can lead to rapid spikes in blood sugar, while low-GI foods offer a steadier energy release. Understanding the glycemic index is important for managing diabetes and can help individuals make healthier dietary choices. Opting for low-GI foods can improve energy levels, stabilize hunger, and reduce the risk of insulin resistance, contributing to overall health.