Million veteran program | veterans affairs
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Genes carry instructions for building and maintaining our bodies. They determine the color of our eyes and hair, our height, and other personal features. Small differences in our genes may
also explain why some people get diseases and others do not. In addition, genes interact with our lifestyle factors and environment to influence our risk for common illnesses, such as heart
disease, diabetes, and cancer. Genes may also affect how people respond to certain medications and treatments. Having a better understanding of how genes work may help to prevent and improve
treatment of disease.