Red, green, yellow, and orange bell peppers are all the same type of pepper but just at different stages of ripeness. Green peppers are unripe, and red are fully ripe, with yellow and orange in between the two. As the peppers age and ripen their taste, their health benefits change too. Red peppers are the sweetest and the richest in nutrition as they hang on the vine the longest. Green peppers are harvested earlier before they have a chance to turn yellow, orange, and then red. Compared to green bell peppers, the red ones have almost 11 times more beta-carotene and 1.5 times more vitamin C.