The hormone known as the "stress hormone" is cortisol, which plays a crucial role in various bodily functions, including metabolism and the stress response. Elevated cortisol levels, often associated with chronic stress, can lead to weight gain, especially around the abdominal area. High cortisol can also result in increased appetite and cravings for unhealthy foods, further complicating weight management efforts. Managing stress through activities like exercise, mindfulness, or relaxation techniques is essential for keeping cortisol levels in check and maintaining a healthy body composition.