Very few people actually need two liters of water a day. But how much do they really need? What changes in the heat, whether ...

Michael Breus, a clinical psychologist and author of "Sleep Drink Breathe: Simple Daily Habits for Profound Long-Term Health," shares tips on how to better hydrate and more.

It can be surprisingly tough to know how much water to drink a day. Nutritionists and a doctor explain how to calculate this properly for your own needs.

Is drinking water from plastic bottles weakening your bones Read ahead to know how BPA affects calcium absorption what ...