Poor nutrition, more likely to live in more heavily polluted areas. Can't be a good combination. We now have a pretty good understanding of how bad leaded gasoline was. Maybe in another fifty years we'll look back at junk food and wonder "how could we have been so stupid"?

I think it would be wise to increase funding of nutritional science. Many of the most basic controversies remain unresolved (fat, sugar, salt). The most bizarre conditions can sometimes be treated using supplements of seemingly unrelated nutrients (behavioural problems: omega 3, migraine: b2). But sample sizes are always small, double blind studies are hard and rare, there are tons of confounding factors.