The Glycemic Index (GI) is a scale that ranks carbohydrates based on how quickly they raise blood glucose levels. Foods with a high GI are digested and absorbed rapidly, causing spikes in blood sugar. Understanding GI is vital as it helps individuals manage their blood sugar levels, which is particularly important for those with diabetes or insulin resistance. Balancing low-GI and high-GI foods can aid in energy management, weight management, and reducing the risk of chronic conditions such as heart disease and obesity.