The glycemic index (GI) is crucial in guiding food choices, as it measures how quickly foods raise blood sugar levels. Foods with a low GI release glucose more gradually, providing sustained energy and preventing spikes in insulin levels. By selecting low-GI foods, individuals can better manage their hunger, promote weight loss, and reduce the risk of type 2 diabetes. Conversely, high-GI foods can lead to rapid energy crashes and increased cravings. Overall, understanding the GI of foods helps in making healthier, more informed dietary decisions.