Melanin-concentrating hormone (MCH) is primarily studied for its role in regulating energy balance, appetite, and body weight. It is widely used in research to understand its effects on feeding behavior and metabolism, particularly in relation to obesity and eating disorders. MCH is also investigated for its influence on mood and stress responses, as it interacts with pathways in the brain associated with anxiety and depression. Additionally, it plays a role in sleep regulation, making it a potential target for studies on sleep disorders. Its involvement in skin pigmentation, though less emphasized in humans, is another area of interest in comparative biology.