"When is somebody going to investigate those areas where there is a statistically significant LACK of a certain (any) disease?"
I suspect the CDC or state health agency would take the easy out and say, "if it ain't broke, then don't fix it". Why use valuable resources to look at something healthy. Still, your point is well taken.
In post six above I mentioned six cases of MS in a subdivision. Actually, it was six cases in only 13 homes. None of the people involved had MS (diagnosed) before they moved to this cul-de-sac. What are the odds of this happening without some common external causative agent?
I suspect the CDC or state health agency would take the easy out and say, "if it ain't broke, then don't fix it". Why use valuable resources to look at something healthy. Still, your point is well taken.
The government method is usually "if it ain't broke, fix it till it is."