How Much Water You Really Need

Water regulates temperature, moves nutrients, cushions joints, and carries away waste — and almost everything else popularly claimed about it comes wrapped in a number: eight glasses, two liters, a gallon challenge. The evidence behind fixed universal quotas is thin. Healthy bodies regulate fluid tightly through thirst and the kidneys, needs swing widely with climate, activity, and diet, and a plant-based plate already delivers more water than most people credit it for.