1. Legumes, avocados, soybeans, nuts, and egg yolks: These contain biotin, and a lack of this chemical can lead to dry skin and brittle hair and nails.
2. Salmon: The carotenoid that gives this fish its pink color, astaxanthin, also improves your skin's elasticity. And it's full of the good fat -- DHA-omega-3 -- that makes your skin and hair look younger and healthier.
3. Green tea: Its polyphenols act to protect you against sun damage and help thicken your epidermis, your body's primary barrier to the outside world.
4. Pomegranates: In addition to thickening your epidermis and helping to produce more collagen and elastin (the stuff that keeps your skin firm and springy), pomegranates contain antioxidants that seem to accelerate wound healing.
5. Tomatoes: The nutrients in tomatoes reduce the chance you'll get a sunburn (but you still have to use an SPF 50 and 4-star titanium dioxide or zinc oxide sunscreen!). It may be due to their lycopene content, but we really don't know the active ingredient. So if there's a choice between a lycopene supplement and the real tomato, choose the product from the vine.