You do need some dispensation for local farmers, because the fast food industry will promote the unsanitary conditions of farming. With vegetables, you have to be careful where they come from; you have to know the farmers and trust them. If you buy from the farmers' market, it's already been investigated.

To the untutored sage, the concentration of population was the prolific mother of all evils, moral no less than physical. He argued that food is good, while surfeit kills; that love is good, but lust destroys; and not less dreaded than the pestilence following upon crowded and unsanitary dwellings was the loss of spiritual power inseparable from too close contact with one's fellow-men.