Making Genetic Changes We used to think that genes created disease and that we were at the mercy of our DNA. So if many people in someone’s family died of heart disease, we assumed that their chances of also developing heart disease would be pretty high. But we now know through the science of epigenetics that it’s not the gene that creates disease but the environment that programs our genes to create disease—and not just the external environment outside our body (cigarette smoke or pesticides, for example), but also the internal environment within our body: the environment outside our cells.
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