What Causes It Sun exposure, smoking, genetics, aging, skimping on produce and “good” fats, eating a diet high in saturated fat and refined carbohydrates, and other factors all conspire to erode collagen and elastin, the fibers that keep skin smooth, flexible, and firm. When dermatologists checked the skin and diets of 453 people from Australia, Greece, and Sweden, they found that while a healthy diet can’t erase damage done by years of unprotected sunbathing or smoking, it can help. Here’s what to eat and what to avoid. Have More of These Olive oil Fish Low-fat milk Water and tea Fruit and vegetables Eggs Nuts and nut butters Beans And Less of These Butter Red meat Cakes and pastries Soft drinks Full-fat milk Margarine Potatoes 1. Put more fruits and vegetables on your plate. When British researchers checked the diets and wrinkles of 4,025 middle-aged women, they found that vitamin C–rich foods reduced the risk of significant wrinkles by 36 percent. This antioxidant vitamin may protec...