Five, the ability of populations with high IQs to give their children better nutrition makes them healthier, more resistant to disease and reduces the risk of mortality, and also improves their children's stature. This brings about the high correlations between regional IQs and the statures of cohorts of military conscripts born in 1855 (r=0.918), 1910 (r=0.902), 1927 (r=0.925), and 1980 (r=0.933). Positive correlations between IQ and stature of around 0.25 at the level of individuals have been reported in a number of studies [...]. This is a corroboration of the positive feedback loop in which the population IQ is a determinant of the quality of nutrition received by children, and the quality of nutrition received by children improves the children's IQs.
