Researchers have found that leptin, a hormone that helps stave off hunger pangs, may also govern the desire to eat. Leptin is a hormone that is produced by fat cells and swims around in the bloodstream before reaching the brain, where it helps reduce hunger and lead to the feeling of “being full.” According to doctors at the University of Cambridge, Addenbrooke Hospital, some people overeat because of the influence of specific hormones and chemicals, including leptin. People who do not produce the hormone tend to eat a great deal of food and also tend to be obese. However, when study participants were treated with leptin, they tended to eat less and also lost weight. While the study is too small to provide conclusive evidence, it does add to a growing body of research in the field of leptin and its effect on appetite.