Leptin is a hormone produced by adipose (fat) tissue that plays a key role in regulating energy balance and body weight. It acts on the hypothalamus in the brain to suppress appetite and increase energy expenditure. Research in the field of leptin has focused on understanding how this hormone functions in the body, how it is regulated, and how its dysregulation can lead to obesity and other metabolic disorders. Additionally, researchers are exploring potential therapeutic applications of leptin in the treatment of obesity and related conditions.