So much for the grapefruit diet, staple of starlets, socialites and other figure-conscious women throughout the seventies and eighties. Consuming as little as a quarter of a grapefruit daily increases risk of breast cancer in post-menopausal women by as much as 30%, a new study shows.
The survey involved interviewing 50,000 post-menopausal women about their grapefruit-eating habits. Researchers theorize that grapefruit slows the metabolizing of estrogen, the hormone associated with breast cancer risk. But they note that further study is needed—especially since subjects were interviewed about consumption of the fruit only, not the juice. (Read more breast cancer stories.)