A new study finds drinking water may improve mental performance on certain brain tests.

To find this, researcher asked 34 adults to abstain from eating and drinking at 9 PM the night before they came into the lab for testing. Participants visited the lab twice-- once they were offered a cereal bar for breakfast with water, and on another day they were only offered a cereal bar. Participants were then given a test in which they had to press a button as soon as they saw an object appear on a computer screen. Researchers found that reaction times were 14-percent faster among those who drank water than those who had no water with breakfast. British researchers explain this may happen because thirsty people are less likely to concentrate on the task at hand. 

[Fox News]