How is it a lie ? Where is this line drawn ? After all farmers like to fertilize fields using manure from animals - which ends up in the plants. Animals breath

How is it a lie ? Where is this line drawn ? After all farmers like to fertilize fields using manure from animals - which ends up in the plants. Animals breathe and exhale CO2, which plants might take up. Plants might have been in contact with or partially eaten by birds, butterflies, deer etc. "contaminating" the plant we later eat, but this does not seem to bother people.