"Culture Can Change our Genes" --- What about Politics?

In an answer to what empirical evidence changed his mind, Nicholas Christakis at Harvard Medical School, wrote a penetrating essay arguing that human genes may be much more influenced by culture that most social scientists would admit. However, there is almost no systematic attempt in the social sciences to think about the question of how the human body (its physical makeup, health status and ultimately genetic expression) is shaped by the everyday political processes. If most culture and social interaction involves politics of power, to what extent could politics also govern human physical well-being, the makeup of our bodies, the physical survival of entire communities, and consequently human evolution in the long-run? You can read Christakis's essay here; its entitled, controversially, Culture Can Change our Genes. More than anything else, it poses some fascinating questions that could guide research in decades to come:

There may be genetic variants that favor survival in cities, that favor saving for retirement, that favor consumption of alcohol, or that favor a preference for complicated social networks. There may be genetic variants (based on altruistic genes that are a part of our hominid heritage) that favor living in a democratic society, others that favor living among computers, still others that favor certain kinds of visual perception (maybe we are all more myopic as a result of Medieval lens grinders). Modern cultural forms may favor some traits over others. Maybe even the more complex world we live in nowadays really is making us smarter.