Veganism is everywhere. But for a word that’s grown so popular, what does being vegan actually mean?Through his Fat Gay Vegan blog, Sean O’Callaghan has become a no-nonsense voice that cuts through the fuss and the fads.He explains the politics of veganism beyond the plate, and why we should all aim to live a little more compassionately.So if you want to know more about the arguments for veganism, the myths around the movement – and the junk food you're still allowed to eat – then like a friendly, fat uncle, Sean is here to pat you on the back, and tell you a bit more of the story…