1. Drinking at least half your body weight in ounces of water per day
And this is the bare minimum, according to Walsh. Chronic dehydration will affect the skin's elasticity and cause premature signs of aging. The best indicator of your hydration is your urine. Someone who is well-hydrated will produce clear or light-colored urine. Dark-colored urine is a sign of dehydration. Need more motivation? Drinking water helps you lose weight because the H2O aids with digestion, keeps your energy levels up, and improves muscle function.