EditorialA recent British review that pooled data from 206 volunteers, for example, found that men on high-fat diets had testosterone levels that were about 60 points higher, on average, than men on low-fat diets. (Aileen Son/The New York Times)
EditorialRace walkers on a low-carbohydrate, high-fat ketogenic diet showed early signs indicative of bone loss. (Christopher Testani/The New York Times)