• iStock

  • REUTERS/Lucas Jackson

  • iStock

  • Rosie Acosta

The key to glowing skin lies in your stomach.

  • 1. Sweet potatoes

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    Beta-carotene, which makes these tubers orange, balances your skin's pH, helps combat dryness, and promotes cell turnover, all resulting in smoother skin.

  • 2. Wild salmon

    REUTERS/Lucas Jackson

    The pigment that makes the fish pink, astaxanthin, is a powerful foe of free radicals, rogue molecules that damage cell membranes and DNA and cause skin to age. A study found that eating one serving every five days can prevent actinic keratoses—ugly rough patches that are precancerous.

  • 3. Tomatoes

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    The fruit's red pigment, lycopene, is a potent antioxidant that shields skin from sun damage—like sunscreen, but from the inside out. To best absorb lycopene, eat tomatoes with olive oil.

  • 4. Citrus fruits

    Vitamin C is essential to building collagen, a vital component of young-looking skin, which starts breaking down in your twenties. Citrus also contains bioflavonoids, which protect skin from UV rays and help prevent cell death.

  • 5. Leafy greens

    Rosie Acosta

    Spinach, kale, and other greens contain lutein, which protects skin from sun-induced inflammation and wrinkles.

  • 6. Stay away from white foods

    Need another reason to avoid white bread, pasta, rice, and other refined grain products? They're quickly broken down into the ultimate white food: sugar. Once in the bloodstream, sugar bonds with protein and creates advanced glycation end products (aptly abbreviated AGEs), which cause collagen to become inflamed and stiff, leading to wrinkles.

  • 7. Why food is always better than a pill

    "There are so many factors in food that haven't been studied." said Nicholas Perricone, a board-certified dermatologist and author of The Wrinkle Cure, The Perricone Prescription, The Perricone Promise and Forever Young. "It's very likely that these unknowns work synergistically for a bigger benefit than what you can find in a supplement."


  • 8. A bonus drink

    According to dermatologist Leslie Baumann, red wine contains skin-friendly grape-seed extract and resveratrol, two powerful antioxidants. Hops in beer, it turns out, may also offer antioxidant benefits.