Researchers analysed health and genetic information from more than 100 studies carried out around the world. These included details on more than 350,000 people from urban and rural communities. The team found that greater genetic diversity is linked to increased height. It is also associated with better cognitive skills, as well as higher levels of education.

However, genetic diversity had no effect on factors such as high blood pressure or cholesterol levels, which affect a person's chances of developing heart disease, diabetes and other complex conditions, researchers said. Researchers from the University of Edinburgh examined individuals' entire genetic make-up. They pinpointed instances in which people had inherited identical copies of genes from both their mother and their father - an indicator that their ancestors were related.

Where few instances of this occur in a person's genes, it indicates greater genetic diversity in their heritage and the two sides of their family are unlikely to be distantly related. It had been thought that close family ties would raise a person's risk of complex diseases but the researchers found this not to be the case, researchers said.

The only traits they found to be affected by genetic diversity are height and the ability to think quickly. The findings suggest that over time, evolution is favouring people with increased stature and sharper thinking skills but does not impact on their propensity for developing a serious illness.

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