It's a good rule of thumb, it seems to me: if you're not allowed to see where something comes from, don't put it in your mouth.
Jonathan Safran FoerThere is an overabundance of rational reasons to say no to factory-farmed meat: It is the No. 1 cause of global warming, it systematically forces tens of billions of animals to suffer in ways that would be illegal if they were dogs, it is a decisive factor in the development of swine and avian flus, and so on.
Jonathan Safran Foer