Intelligence’s Effect on Sperm Quality

The Economist presents a short article on how intelligence predicts—among other health benefits—sperm quality. Something I pointed to a couple of months ago when research results were first coming through.

Recently, it has been discovered that an individual’s [intelligence] is correlated with many aspects of his health, up to and including his lifespan. One possible explanation for this is that intelligent people make better choices about how to conduct their lives. They may, for example, be less likely to smoke, more likely to eat healthy foods or to exercise, and so on.

Alternatively (or in addition) it may be that intelligence is one manifestation of an underlying, genetically based healthiness. That is a view held by many evolutionary biologists, and was propounded in its modern form by Geoffrey Miller of the University of New Mexico […]. These biologists believe intelligence, as manifested in things like artistic and musical ability, is such a reliable indicator of underlying genetic fitness that it has been chosen by members of the opposite sex over the millennia. In the ensuing arms race to show off and get a mate it has been exaggerated in the way that a peacock’s tail is. This process of sexual selection, Dr Miller and his followers believe, is the reason people have become so brainy.

Two complementary articles: The ‘evolution’ high of culture, Evolution has not come to an end (even if natural selection has).