Scientists have known for ages that metabolism is tied to the body’s daily rhythms. Two new studies suggest how.

Viagra eases some sexual problems for women taking antidepressants

Skeletal muscle stem cells can fix weakling muscles in mice and could eventually lead to treatments for muscular dystrophy.

Since the development in the mid-1990s of a state-of-the-art drug cocktail for HIV, patient survival has extended dramatically, a new study shows.

A new way to treat diabetes could recruit cells in the gut to make insulin when the pancreas can’t.

Old-fashioned gene hunting wasn’t terribly efficient. Geneticists typically pursued one gene at a time, armed only with guesses—usually wrong—about which chunks of genetic code might be linked to human disease. Geneticists managed to bag a few trophies anyway—genes for Huntington’s chorea and cystic fibrosis, for example—mostly in rare diseases caused by a problem in a single, high-powered gene. Unfortunately, most of the more common diseases, such as type II diabetes, are instead controlled by a whole crowd of gene variants, each playing a small and often subtle rol...