Good Reasons for Bad Feelings (IMAGE) Arizona State University Caption In Randy's Nesse's new book, "Good Reasons for Bad Feelings: Insights from the Frontier of Evolutionary Psychiatry" his shift on a focus from diseases to traits that make bodies vulnerable to diseases was the crucial insight that became a cornerstone for evolutionary medicine. The same goes for our brains. "Our brains were shaped to benefit our genes, not us," said Nesse. "And evolutionary psychiatry is the part of evolutionary medicine that asks why natural selection left us vulnerable to mental disorders." Credit Dutton (Penguin Random House) Usage Restrictions Please credit book publisher in use of image. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.