Dark, leafy greens are packed with a variety of what you might call “anti-aging nutrients,” but they’re especially well-armed when it comes to battling your youth’s most visible enemy: wrinkles.  Swiss chard, for example, is rich in beta-carotene, an antioxidant that your body converts to vitamin A and then uses – actually, requires – for skin growth and repair processes.  It’s also a great source of vitamin C, which is essential for the production of collagen (the stuff that keeps your skin firm and flexible) while also protecting cells from damage by free radicals.  For a fresh, summer spin on Swiss chard, slice it up with peppers and onions, mix it with a basic vinaigrette, and you’ve got a satisfying slaw.