an apple a day (keeps the doctor away)

an apple a day (keeps the doctor away)

A proverbial preventive remedy. Versions of this saying date from the seventeenth century or earlier, appearing in John Ray’s proverb collection of 1670 and elsewhere. A cliché by the late nineteenth century, it gave rise to numerous humorous versions, such as “A stanza a day to keep the wolf away” by the poet Phyllis McGinley.
See also: apple, doctor