3. Oranges
Aside from being astonishingly high in vitamin C, oranges are actually quite high in fiber as well. In fact, one orange is said to have between 3.1 to 4 grams of fiber, which is already 13% of the recommended daily fiber intake for adults. Plus oranges also contain flavonol, which is a naringenin. Research in a Chinese study showed that this also works as a laxative, which helps lessen the chances of constipation setting in.