I was vegan for about 5 months a few years ago. It's easier to eat fewer calories as a vegan, i found, because vegan foods are lower in calories. HOWEVER, it was super hard to maintain. I say, check it out for a week. See how you feel. Make the decision then. Just make sure you're getting enough protein, and I recommend staying away from that processed vegetarian/vegan food as much as possible. Keep us posted!