20 Foods That Keep You Young

We think of OJ as the go-to for vitamin C, but it turns out that this tropical fruit trumps oranges big time. “One cup of guava supplies four times what you need in a day of vitamin C,” says Grotto. We need this vitamin to help protect against free radical damage that leads to aging, heart disease, and cancers. Plus, it contributes to collagen formation, which benefits skin, tendons, bones, and teeth.