Hydrating foods provide plenty of fluid and healthy nutrients to fuel hot summer runs.

By Leslie Goldman Image by Mark LaitaFrom the July 2011 issue of Runner's World

Here's some juicy news: Drinking water isn't the only way to stay hydrated. According to the Institute of Medicine, 20 percent of your water intake comes from food. "Eating a three-ounce cucumber is like drinking three ounces of water, but better," says Howard Murad, M.D., author of The Water Secret. Besides being water-rich, vegetables, fruits, and a few other key foods contain nutrients that can boost a runner's performance and health. In addition to filling your water bottle, add these foods to your diet for hydration, nutrients, and a tasty change of pace.

H2O+ ELECTROLYTES
CANTALOUPE, PEACHES, STRAWBERRIES
These fruits are mostly water and rich in potassium, an electrolyte lost through sweat. "Potassium and sodium work together to maintain fluid levels in the body," says Wendy Bazilian, Dr.PH., R.D., author of The SuperFoodsRx Diet, "which helps regulate your heartbeat and circulation." One cup of each contains between five and 10 percent of your daily needs.

WET YOUR APPETITE
Toss strawberries into guacamole. Or make a cool soup: Blend together peaches, cantaloupe, peach nectar, lime juice, and sea salt, says culinary nutritionist Jackie Newgent, R.D.

H2O + VITAMIN C
WATERMELON, KIWI, CITRUS
Vitamin C helps maintain cartilage and joint flexibility, and these fruits provide at least a third of your daily need per serving. It also plays a role in protecting your skin. "UV rays, pollution, and sweat negatively affect your skin," Bazilian says, and vitamin C counters those effects. A study in the Journal of Agricultural and Food Chemistry found watermelon and kiwi are nearly as healthy six days after being cut, so make fruit salad for the whole week.

WET YOUR APPETITE
Stir-fry tofu, bok choy, and scallion; add grapefruit segments. Combine kiwi with greens, avocado, pistachios, and onion. Toss watermelon with feta and mint.

H2O + CANCER DEFENSE
TOMATOES, BROCCOLI
Tomatoes are rich in lycopene; studies link this antioxidant to a reduced risk of lung, stomach, prostate, breast, colon, and cervical cancer. While it may not seem juicy, broccoli is 90 percent water and contains compounds called isothiocyanates. A 2010 study in the Journal of Medicinal Chemistry found isothiocyanates block a defective gene that causes cells to become cancerous.

WET YOUR APPETITE
Skewer cherry tomatoes and grill until lightly charred; add mozzarella balls, balsamic vinegar, and fresh basil. Stir-fry broccoli with grated ginger; add minced grapes and sunflower seeds.