1. Avocados are not just for eating! A good source of biotin, avocados help to prevent dry skin and brittle hair and nails. When applied topically, they can hydrate parched skin.

2. Sip your way to healthy skin. Green tea's high on the list of skin-friendly beverages thanks to its impressive storehouse of polyphenols. Aim for four cups throughout your day.

3. Reach for tomatoes. A German study found that lycopene-rich tomato paste helped participants prevent sunburn when they combined it with olive oil, daily for ten weeks. Besides being a great source of the antioxidant lycopene, tomatoes are considered a high-carotenoid fruit. These nutrients may help slow down cellular damage from free radicals.

4. Slow down aging with salmon. Salmon contains astaxanthin, a carotenoid that improves skin elasticity, so you'll have fewer fine lines.