Today’s idiom: you are what you eat
Meaning: the good you eat determines your health
Origin: Though two similar phrases can be found in the 1800’s, it was really the 1920’s that this phrase came about. In 1923 nutritionist Victor Lindlahr wrote: “Ninety per cent of the diseases known to man are caused by cheap foodstuffs. You are what you eat.” Later, in 1942 he wrote You Are What You Eat: how to win and keep health with diet. He also had some time on the radio and so might have popularized the phrase in that medium as well.