A variant of the proverb, “Eat an apple on going to bed, and you’ll keep the doctor from earning his bread” was recorded as a Pembrokeshire saying in 1866.

A 2015 study found apple eaters “were more likely, in the crude analysis, to keep the doctor (and prescription medications) away.” When they adjusted for “sociodemographic and health-related characteristics, however, the association was no longer statistically significant”. The study also found that people who ate an apple a day used fewer prescription medications.

Winston Churchill n’en pensait pas moins dans une de ses saillies dont il avait le secret : « Une pomme par jour éloigne le médecin, pourvu que l’on vise bien ! »

https://fr.wikipedia.org/wiki/Une_pomme_par_jour_éloigne_le_médecin