Another biological influence on IQ

"Scientists have discovered why some shorter children do worse at school than taller youngsters. A team from the University of Bristol found that children with lower levels of a height controlling hormone also had lower IQs. The study is the first to make a link between the insulin-like growth hormone and intelligence. Professor David Gunnell and his colleagues measured levels of Insulin Growth Factor IGF-I in the blood of 547 children, who also took an intelligence test at the age of eight. When the researchers compared IGF-I levels in the youngsters in the study, they found a significant link between the growth hormone and intelligence. For every 100 nanograms per millilitre increase in IGF-I levels, the IQ increased by three points.

At the moment scientists do not know what happens in the body to link poor growth and impaired development in the brain. But one explanation could be that growth hormones also affect brain development. They said this effect seemed to be restricted to the verbal component of IQ, as the link was not seen in other tests.... The study, part of the long-running Children of the 90s project, is published in Pediatrics"

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