6 Reasons to Drink More Water

The most debilitating kind as well: Migraines. In one study published in the journal Neurology, scientists recruited migraine sufferers and divided them into two groups: one took a placebo, the others were told to drink 1.5 liters of water (about six cups) in addition to their usual daily intake. At the end of two weeks, the water group had experienced 21 fewer hours of pain than those in the placebo group, as well as a decrease in pain intensity.