Pure fruit juice, though often rich in the same vitamins, minerals and cancer–fighting phytochemicals as the whole fruits they’re made from, don’t contain fiber. Though you may feel full after snacking on an orange, you probably won’t after drinking a glass of orange juice–but you’ll end up consuming more calories, because juice condenses a fruit’s calories into a small amount. A glass of juice here and there won’t hurt–but stick with whole fruits first.