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Arthur De Vany, of the University of California, Irvine, and creator of Evolutionary Fitness, talks with EconTalk host Russ Roberts about performance-enhancing drugs in baseball and Evolutionary Fitness, De Vany's ideas about diet and fitness. In the first part of the conversation, De Vany argues that there is little physiological or statistical evidence that steroid use increases home run totals in baseball. The second part of the conversation turns to De Vany's theories of diet and exercise. De Vany argues that our diet and exercise regime should take account of our evolutionary origins, an earlier time when we ate no grains and our exercise was a mix of intense activity punctuated by much milder activity. He argues that jogging is unhealthy and that we would live longer and feel better if we followed a different exercise routine than most Americans do today.