While poor diet is certainly the leading hypothesis, the universality of the effect across both Human and Animal populations is worth further consideration. Th

While poor diet is certainly the leading hypothesis, the universality of the effect across both Human and Animal populations is worth further consideration. The poor are vastly more likely to live in areas of higher industrial runoff, to use older materials/homes/appliances, have poorer water quality, and have fewer resources to counteract negative effects in the environment.