The key hormone that regulates blood sugar levels is insulin. Produced by the pancreas, insulin facilitates the uptake of glucose by cells, thereby lowering blood sugar levels after meals. Proper insulin function is crucial for metabolic health and energy balance. In diabetes, insulin regulation is impaired, leading to elevated blood sugar levels, which can have serious health consequences if untreated. Therefore, maintaining healthy insulin sensitivity through diet and exercise is vital for overall welfare and disease prevention.