Rip, a former professional triathlete and now an Austin firefighter, is the author of The Engine 2 Diet, a book offering a plant-based diet that lowers cholesterol, drops pounds, and prevents a host of diseases. Remarkably, he challenged his fellow Engine 2 firefighters to eat this way during a pilot study—and the results were spectacular. In an accessible and down-to-earth way, Rip discusses the problems with animal products and explains how and why the diet works.

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February 25, 2009: Rip Esselstyn