If you want to go totally vegan, then it is very important for you to remember that your body will still be in need of vitamin B12, suitable sources of which are not found in fruits and vegetables. A vitamin B12 deficiency will eventually leave you with an anemic blood count. You don't want this to happen to you because an anemic blood count can cause permanent neurologic damage. Anyway, I highly recommend that all new vegans learn all they can about this vitamin.
"Let your food be your medicine and let your medicine be your food." -- Hippocrates