I was vegan for only about 6 months. Doable. Did it for a
  girlfriend. Was vegetarian a number of times. Much much easier
  to deal with. But, I like beef. Steak in particular. But if I
  had to go back, I could. It's not hard as long as you learn
  proper nutrition. Pasta Vegans are future diabetics but with
  proper diet education, it's doable