Are You Drinking Enough Water? Do we really need 8 glasses <br />of water a day? Science finally has <br />the answers. Every organ in the body needs water to function optimally, and most Americans simply aren't <br />drinking enough. Dehydration can cause headaches, dizziness, fatigue and irritability. The general rule of thumb for daily water consumption? Drink half your body weight in ounces. So, a 120-pound person would need 60 ounces of water a day. Drink up!
