Phew, survived Tesco and the overwhelming temptation - just put oven on for some roast sweet potato as I'm in a carb mood.
Lochan - would think you will be okay doing veganism for lent. The effects of malnutrition does not occur overnight. From what I learnt at the Vegetarian Society pulses and grains are an important factor. Quinoa will become your friend, with it being a complete protein source and loaded with calcium - let's just say you shouldn't suffer malnutrition if you eat a bowl of quinoa a day along with your veggies hehe!