Al Gore
In 2013, Gore went vegan. He had earlier admitted that "it's absolutely correct that the growing meat intensity of diets across the world is one of the issues connected to this global crisis -- not only because of the carbon dioxide involved, but also because of the water consumed in the process" and some speculate that his adoption of the new diet is related to his environmentalist stance. In a 2014 interview, Gore said "Over a year ago I changed my diet to a vegan diet, really just to experiment to see what it was like. ... I felt better, so I've continued with it and I'm likely to continue it for the rest of my life."