When you say unsanitary conditions, I agree... but what do people get from such conditions?
INFECTIONS and what IS now available to treat that? Antibiotics ?
Modern sewage and water treatment with chlorine and fluoride is part of avoiding infections,
and so is modern medicine and prompt diagnosis, but I know
of people on farms who are sick less than cityfolk, (often living into their late ninetys).
(I am sure it has to deal with fewer muggings and not being hit by buses... or breathing the exhaust fumes.)