"A bodybuilder can lift weights all day long, but if he doesn't eat a diet rich in protein, he'll never build any muscle. When it comes to keeping your skin in tip-top shape, the same principle applies: You can buy the best most expensive skin creams in the world, but without feeding your body the essential building blocks of collagen and elastin, your skin will slowly loose its resilience and start to wrinkle and sag." - Jessica Wu, M.D.
I couldn't have put it better myself. By eating the right foods, you can supplement collagen production which will help keep your skin strong and flexible.
Keep these foods on your grocery list:
Chicken, beef, lamb, lean meats, soy, pork quail, bison, lobster, srab, shrimp, scallops, (proline) cottage cheese, cabbage and bamboo shoots
Spinach, whole grains, almonds, cashews, peanuts, soybeans, brown rice, lentils, kiddney and pinto beans, and avacados.
Whole grains, legumes, tofu, soybeans, shellfish, cherries, and prunes.
Red meat, raw oysters and shellfish, kidney beans and lentils, and eggs.
Amino acids and protein are very important to the collagen molecule, and pairing magnesium with some Vitamin C will be vital for collagen production.
Wu, Jessica (February 2011). Feed Your Face: Younger, Smoother Skin and a Beautiful Body in 28 Delicious Days. Jessica Wu.