Lack of sleep negatively affects body weight management by disrupting metabolic processes and increasing insulin resistance. Sleep deprivation alters hormone levels, particularly ghrelin and leptin, leading to increased hunger and reduced satiety signals. This hormonal imbalance can drive individuals to consume more calories, particularly from high-calorie foods. Additionally, fatigue often results in decreased motivation for physical activity. Over time, these factors can contribute to weight gain and difficulty in maintaining a healthy body composition, highlighting the importance of sufficient sleep for effective weight management.