Trisha Gura
During the 2 years since its discovery, the protein hormone leptin has paraded through headlines because of its possible role in keeping fat levels in check. But that may not be its main function. New works suggests that leptin, working through glands around the body, including the adrenals, the thyroid, and even the ovaries and testes, may have more to do with helping the body deal with the stresses of starvation.