"Alcohol and drugs are not the problems; they are what people are using to help themselves cope with the problems. Those problems always have both physical and psychological components- anything from anemia, hypoglycemia, or a sluggish thyroid to attention deficient disorder, brain-wave pattern imbalances, or deep emotional pain."

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Needless to say, jamming deformed, drugged, overstressed birds together in a filthy, waste-coated room is not very healthy. Beyond deformities, eye damage, blindness, bacterial infections of bones, slipped vertebrae, paralysis, internal bleeding, anemia, slipped tendons, twisted lower legs and necks, respiratory diseases, and weakened immune systems are frequent and long-standing problems on factory farms.

— Jonathan Safran Foer