作者Gregory Y.Titelman在其词典《Random House Dictionary of Popular Proverbs and Sayings》中有这样的说明：
"An apple a day keeps the doctor away.Eating fruit regularly keeps one healthy.First found as a Welsh folk proverb " 'Eat an apple on going to bed,/ And you'll keep the doctor from earning his bread.' First attested in the United States in 1913,An apple a day keeps the doctor away."
“An apple a day keeps the doctor away.经常吃苹果可以让人保持健康.最早出现在英国威尔士的谚语中---如果大家睡觉前都能吃一个苹果,我们就会让医生们连面包也买不起了（无法维持生计了）在1913年,美国最先改动了威尔士的谚语,在美国出现了An apple a day keeps the doctor away.”