An apple a day keeps the doctor away. It's a common English idiom that means you should eat healthy in order to not get sick. It's not specifically about apples but apples refer to any healthy food. Check out this video for more details about this expression.
An apple a day keeps the doctor away meaning: Eating healthy keeps you from getting sick.
Origin: First seen in the late 1800s to early 1900s in Wales. In old English, an apple could refer to any round fruit so it may be related to the fact that healthy eating is vital for good health.
Examples:
My mother used to say, “An apple a day keeps the doctor away.”
"Don't forget that an apple a day keeps the doctor away! Stop eating so much junk food!"
Want to find out more?
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The Big Book of American Idioms: https://amzn.to/3o6YxZi
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