When it comes to longevity, we all know the importance of eating a healthful diet. But can certain foods actually make you look younger too? Certainly, says Ann Louise Gittleman, N.D., M.S., C.N.S.

More on the nutrition expert:
Read about Gittleman's latest book.
Gittleman's biography.
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Get Gittleman's full chat transcript.

A leading nutritional expert on aging, diet and health, Gittleman recently chatted with myprimetime.com, and shared her secrets for younger looking skin.

"I'd say the most important thing is to make a habit of taking that one tablespoon of high lignin flaxseed oil every day, or a combination of flaxseed oil and evening primrose oil, which is contained in a product called Barlean's Essential Woman," asserts Gittleman. "These are two beautifying oils that will give you very dewy skin, shiny hair and healthy-looking nails as well." Gittleman says these oils seem to work by helping to transport oxygen throughout your body.

And don't forget the healthful fats, says Gittleman. "I believe that it's the right fats, above and beyond any other food group, that are the gatekeepers of your appearance and will help to ward off wrinkles and dryness."

One of the best things you can do for your skin is to get plenty of that "elixir of life," purified, filtered water, says Gittleman.

"Drinking at least 10 glasses of water a day — not just the eight glasses we're often taught are so healthful — will do much to help your body rehydrate, plump up skin and metabolize and dilute all of your bodily wastes and toxins."

"I'm not a believer in distilled water, which I have found can actually leach calcium from the system if used as your sole water source," she adds. "But water is incredibly important for beautiful skin, and it will take the edge off hunger."