Jennifer Aniston made a comment last year that she "gets cranky" when she doesn't drink enough water, the Arizona Republic reported. And now a new study shows that there may be some science behind it.
A new, small study of 25 women suggests that being dehydrated can take a toll on women's mood and cognitive function.
In the study, published in the Journal of Nutrition, researchers found that dehydration was a key factor in causing headaches, loss of focus, fatigue and low mood while exercising and resting, TIME reported.
TIME also pointed out that the women in the study weren't severely dehydrated -- just about 1 percent lower than their optimal hydration levels.