Chronic stress can lead to weight gain primarily due to the body's release of cortisol, a hormone that triggers hunger and cravings for high-calorie foods. This stress-related eating can contribute to an energy surplus, promoting fat accumulation, especially in the abdominal area. Furthermore, stress may lead to reduced motivation for physical activity, compounding the issue. Managing stress through techniques such as mindfulness, exercise, and proper sleep can help mitigate its impact on weight.