The proverb "An apple a day keeps the doctor away", addressing the health effects of the fruit, dates from 19th century Wales, according to Caroline Taggart, author of "An Apple a Day: Old-Fashioned Proverbs and Why They Still Work". The original phrase, Taggart said, was: "Eat an apple on going to bed, and you'll keep the doctor from earning his bread". In the 19th century and early 20th, the phrase evolved to "an apple a day, no doctor to pay" and "an apple a day sends the doctor away", while the phrasing now commonly used was first recorded in 1922.
Source #Wikipedia
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