Soo-Jong Um, Ji-Cheon Jeong and colleagues describe previous studies indicating that piperine reduces fat levels in the bloodstream and has other beneficial health effects. Black pepper and the black pepper plant, they note, have been used for centuries in traditional Eastern medicine to treat gastrointestinal distress, pain, inflammation and other disorders.
Their laboratory studies and computer models found that piperine interferes with the activity of genes that control the formation of new fat cells. In doing so, piperine may also set off a metabolic chain reaction that helps keep fat in check in other ways.

Citation: “Piperine, a Component of Black Pepper, Inhibits Adipogenesis by Antagonizing PPARγ Activity in 3T3-L1 Cells” Journal of Agricultural and Food Chemistry