The average person's skin weighs around 7 to 10 pounds. "It's the largest organ in your body," says Dr. Angela Yen Moore, owner of highly rated Arlington Center for Dermatology in Arlington, Texas. "When skin looks healthy, that's generally because it is healthy."

To ensure your skin stays radiant, highly rated dermatologists recommend these tips:

• Protect yourself from the sun's harmful rays. "It's trite, but true," says dermatologist Dr. Joel Schlessinger of Omaha, Neb. "I see problems from sun exposure on a daily basis, but it's avoidable." He suggests using a sunscreen with SPF 30 that contains either zinc oxide or titanium dioxide for optimal protection.
• Stop lighting up. "The most important thing you can do to protect your skin is to stop smoking," Moore says. "The tobacco smoke released into the air dries out your skin, damages many organs, and can cause premature aging and yellowing of the skin."
• Rinse and moisturize. Dr. Vail Reese, of Union Square Dermatology in San Francisco, says you should wash your face twice a day and apply moisturizer afterward. "Moisturizers work best when applied to wet skin," he says. "Though it may feel like the cream is thinned by the water, it's actually locking in the water drops."
• Keep well hydrated. Moore says drinking 8 to 10 glasses of water per day is ideal. "Water will help keep your skin moist and supple, and less likely to wrinkle," she says.
• Work it out. It's no secret that exercise is good for your whole body, but Moore says it's also great for your skin. Some of the benefits are increased skin tone and maintained elasticity. "It also increases the blood flow to your skin and gives it a healthy glow."