African americans have a higher frequency of the gene variants associated with the conversion of dietary, medium chain omega-6 polyunsaturated fatty acids (found in margarine, vegetable oils, animal fats and processed foods) to long chain omega-6 PUFAs that then have the potential to increase inflammation.
So genes affect diet, and diet affects risk in cardiovascular disease and diabetes, which are also more common in African americans : A nice example of gene/environment interactions.
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