Watermelon

Staying hydrated keeps your memory sharp and your mood stable. It also helps keep your body cool (by sweating) during hot summer months. The good news is that you dont just have to drink water. You can eat it, too: in addition to delivering skin-protecting lycopene, watermelon is 92 percent water (hence the name). Another boon? Research shows that eating foods that are full of water helps keep you satisfied on fewer calories. (Interestingly enough, drinking water alongside foods doesnt have the same effect.)