Tip: Eat red foods to avoid turning red in the sun

Slathering on the sunscreen will help you ward off skin damage from the sun, but you also may want to power up your insides when you go outside.

Researchers at the Universities of Newcastle and Manchester in Great Britain found that lycopene, an antioxidant that gives many foods their red color, can protect the skin against sunburn and premature aging caused by ultraviolet rays.

Most people know lycopene is found in tomatoes. But there's another fresh fruit that is even more loaded with lycopene: watermelon. In fact, there is 75 percent more lycopene in an ounce of watermelon than in an ounce of red, raw tomatoes, according to the U.S. Department of Agriculture. Tomatoes are still the lycopene champions, however, as long as you cook them. A one-ounce serving of tomato sauce or ketchup has nearly six times as much lycopene as an ounce of raw tomatoes.