An Apple a Day Keeps the Doctor Away
Small daily habits prevent big problems — the cheerful 19th-century health-marketing proverb.
Origin
An older Welsh form is recorded in 1866: 'Eat an apple on going to bed, and you'll keep the doctor from earning his bread.' The compressed modern version emerges in American magazines in the 1910s and 1920s, just as the apple industry was promoting domestic consumption. The Washington apple growers' association used it heavily in print ads; whether or not it was their coinage, they did the most to spread it.
Modern usage
Quoted at every child resisting fruit, every parent rationing junk food, and every wellness influencer reaching for a folksy hook. The medical literature consistently fails to support the literal claim but consistently finds people who eat fruit daily are healthier overall, which is the proverb's actual point.
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