What's the meaning of ''you are what you eat''?

Question

What's the meaning of ''you are what you eat''?

Answer 1

If you eat well, you will be well; but if you eat badly you will feel bad

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Proverbs: You are what you eat

Ger. Mann ist was Mann isst, man is what man eats; cf. the philosopher Ludwig Feuerbach (1804-72) in Jacob Moleschott Lehre der Nahrungsmittel: Für das Volk (1850) ‘Advertisement’: Der Mensch ist, was er isst, Man is what he eats. The saying is sometimes attributed to the French gastronome Anthelme Brillat-Savarin who wrote in his Physiologie du Goût (1825): Dis-moi ce que tu manges, je te dirai ce que tu es, Tell me what you eat, and I will tell you what you are.

There flashed through her mind the German saying, ‘One is what one eats.’

[1930 J. Gollomb Subtle Trail ii. 55]

You are what you eat.

[1940 V. H. Lindlahr (title)]

Food faddists in recent decades have declared, ‘You are what you eat’.

[1980 Farb & Armelagos Consuming Passions 3]

As obesity, chronic health problems and crime rise, we should pay far more attention to the adage ‘You are what you eat’.

[2002 Times 2 July 19]

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Answer 2

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Answer 3

   If  I  would  ingest  something  I  will  surely  suffer  the  consequences  or  possibly  reap  the  rewards.  It is  this  tearing  down  or  building  up  through diet  that   the  phrase  refers.