Caldwell Blakeman Esselstyn Jr. is an American physician, author and former Olympic rowing champion. Esselstyn is the author of the award-winning Prevent and Reverse Heart Disease, in which he argued for a low-fat, whole foods, plant-based diet that avoids all animal products and oils, as well as reducing or avoiding soybeans, nuts and avocados. The diet has been advocated by former U.S. President Bill Clinton.