The glycemic index (GI) influences food choices by categorizing carbohydrates based on their impact on blood sugar levels. Foods with a high GI raise blood glucose more quickly than those with a low GI, which are digested and absorbed more slowly. Choosing low-GI foods can be beneficial for longer-lasting energy, reduced hunger, and better insulin control, particularly for those managing conditions like diabetes. Understanding GI can guide individuals in selecting foods that fit their health goals, potentially leading to better overall dietary habits.