G Living's Brendan Brazier is one the world's few professional athletes whose diet is 000 percent plant based. He's a professional Ironman triathlete, bestselling author on performance nutrition, and the creator of an award-winning line of whole food nutritional products called Vega.  The following is our second excerpt from Brendan's new book "The Thrive Diet", on sale now in Canada and and in the U.S. in January.  