He does not claim to know what all of those benefits are, making clear at the outset that since this is a new field, his conjectures may well prove wrong. Nesse notes that identifying the brain abnormalities and genes responsible for specific disorders has not, contrary to expectations, led to much progress for example, there have been “no major breakthroughs in the treatment of depression in the last 20 years.” He hypothesizes that since natural selection did not eliminate “anxiety, depression, addiction, anorexia, and the genes that cause autism, schizophrenia, and manic-depressive illness,” they must have some benefits. Nesse ( Why We Get Sick), director of the Center for Evolutionary Medicine at Arizona State University, thought-provokingly comments on modern medicine’s continuing difficulties in treating mental illness.
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