Hormones play a vital role in regulating appetite and metabolism, influencing body weight and energy balance. Hormones such as leptin, produced by fat cells, signal satiety and energy storage, while ghrelin, released by the stomach, stimulates hunger. Insulin, another key hormone, regulates how the body uses and stores glucose, impacting overall metabolism. An imbalance in these hormones can lead to increased appetite and reduced energy expenditure, contributing to weight gain. Understanding hormonal influences provides insight into managing obesity and metabolic disorders more effectively.