Watermelon

The name says it all — this fruit is 92 percent water, which can help fill you up and rid your body of excess sodium. Plus, this super-sweet, vitamin-C-rich fruit clocks in at less than 100 calories per cup or large wedge, so it’s a great snack for people trying to lose weight (and will give you glowing summer skin to boot!). At your next barbecue, pass on the heavy, mayonnaise-drenched side dishes and try a watermelon salad: Simply cut the melon into bite-sized cubes and combine with red onion, red-wine vinegar, mint leaves, and a dash of olive oil.