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an apple a day keep the doctor away “An apple a day keeps the doctor away” is a type of idiom in the English language meaning that maintaining regular, healthy habits helps to prevent illness. Unlike many sayings, this phrase can be interpreted literally in some cases
a doctor So, for instance, a professor at a university may be called "doctor" with the short title "Dr" even if his area of expertise has nothing to do with medicine/health he may teach philosophy or history for example. A physician, on the other hand, is always a doctor of medicine