The rapidly expanding population of our planet is straining resources for land along with fresh water and air. A vegan diet has many benefits for health that I promote to my cardiac patients, but the smaller strain on the environment of a plant-based diet is often overlooked when discussing (or arguing) diet choices with my pro-Paleo patients. New data published in a prestigious medical journal now sheds light on how resources needed to produce different kinds of foods compare and the data is shocking.