Smart and sweet, apples are rich in quercetin, an antioxidant that can bolster your body’s disease-fighting abilities. In one study from Appalachian State University, just 5 percent of people who ate more quercetin came down with a respiratory infection over a two-week period, compared to 45 percent of those who didn’t.
A cup of broccoli has 100 percent of your vitamin C—crucial for production of collagen, which gives skin elasticity,” says Tammy Lakatos Shames, R.D. It’s also rich in beta-carotene, which the body converts to vitamin A. This vitamin assists in cell turnover, so old skin cells are replaced with fresh.