Our scientific knowledge is continually evolving—don't forget that 80 years ago, doctors recommended cigarettes. Here's the latest information on controversial health topics.

Trillions of microscopic organisms make up your microbiome, and scientists are beginning to pin down the ways that these bugs can help or hurt your health

The dozens of choices you make over the course of any average day really can determine whether you’ll develop dementia years from now, as well as how quickly the disease will progress