Low IQ Correlates with Poor Health

But you are not supposed to say so:

"The London School of Economics is embroiled in a row over academic freedom after one of its lecturers published a paper alleging that African states were poor and suffered chronic ill-health because their populations were less intelligent than people in richer countries.

Source

In his studies of high IQ Americans, initiated in the 1920s, Terman found that they had some physical as well as mental advantages, including better health. And a recent study by Friedman & Markey has now shown that the same group live a bit longer too.

So the finding causing the uproar should be no surprise to those who know the relevant research. The brain is just one organ of the body so we should not be surprised that there is some tendency for well-functioning brains to be found in bodies that are well-functioning generally.

Reference:
Friedman, H. S. & Markey, C.N. (2003). Paths to longevity in the highly intelligent Terman cohort. In C.E. Finch, J-M. Robine & Y. Christen (eds.), Brain and Longevity (pp. 165-175). NY: Springer.