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.
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.
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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.
"Our research answers questions first posed by Darwin as to the benefits of genetic diversity. Our next step will be to hone in on the specific parts of the genome that most benefit from diversity," said Dr Peter Joshi, of the University of Edinburgh's Usher Institute, said.
The study was published in the journal Nature.