winter runner running in snowIs walking as effective as running?Mark Wilson/Getty ImagesIt seems every week there’s a new study or report that contradicts everything you know about how to manage your health.

In the past few years alone, we got more evidence that coffee isn’t a cause of cancer and the debate over the health effects of sugar became even more heated.

To help you parse out what works from what’s merely myth, we compiled the definitive (at least for now) answers to some of the most pressing health questions, based on the book “Your Health: What Works, What Doesn’t.”

Here’s what the science has to say.