An orange a day will keep the doctor away," would be a more correct statement than is the old adage with which we are all familiar. Knowledge of the merit of orange juice :·n the diet is very recent and has come to us as a result of research and experimental work with laboratory animals and with children. Just a few years ago oranges were eaten simply because they were palatable and offered a change in the diet. They were "good to eat" and so people ate them. That perhaps is still a reason for their popularity but at the same time there are other factors to consider.