Can what you put on your plate affect what you see in the mirror? Absolutely! But a few tweaks to your eating habits can go a long way to keeping your skin youthful and your body healthy.
Poor-quality foods, like trans fats, cause inflammation -- and aging is basically a chronic inflammatory state. For example, eating too much sugar and processed carbohydrates (like pasta, bread, and baked goods) can lead to damage in your skin's collagen, which keeps your skin springy and resists wrinkles. Not to mention that these foods also are tied to diseases like heart disease and diabetes.
Foods to limit? Anything that's deep-fried, aka potato chips, donuts, french fries, in oil can add to inflammation throughout your body. Especially avoid trans fats. It can raise your LDL "bad" cholesterol and lower HDL "good" cholesterol, which increases your risk for heart disease. Check food labels and avoid "partially hydrogenated oils" and "vegetable shortening."