A single gene influences whether breastfeeding improves a child's intelligence, say London researchers.Children with one version of the FADS2 gene scored seven points higher in IQ tests if they were breastfed.
But the Proceedings of the National Academy of Sciences study found breastfeeding had no effect on the IQ of children with a different version.
The gene in question helps break down fatty acids from the diet, which have been linked with brain development.
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