emotions are chemical feedback, the end products of experiences we have in our external environment. So as we react to a situation in our external environment that produces an emotion, the resulting internal chemistry can signal our genes to either turn on (up-regulating, or producing an increased expression of the gene) or to turn off (down-regulating, or producing a decreased expression of the gene). The gene itself doesn’t physically change—the expression of the gene changes, and that expression is what matters most because that is what affects our health and our lives. Thus, even though
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