Hormones play a crucial role in weight fluctuations by regulating processes such as appetite, metabolism, and fat storage. Key hormones like insulin, leptin, and ghrelin influence hunger signals and energy expenditure. For example, elevated levels of insulin can promote fat storage, while leptin helps to regulate energy balance by signaling satiety. Hormonal imbalances due to stress, sleep deprivation, or changes in diet can lead to weight gain or loss. Understanding these hormonal influences can empower individuals to make informed lifestyle choices and manage their weight more effectively.