Caught your attention hmm. I found this article right now about this guy who says you need animal products to survive. Of course I don't believe it though. Thought maybe some people whould like to read it. The site http://chetday.com/vegandietdangers.htm
Here's a part from the article, "I think it's important for most people, especially individuals like me who zealously followed strict vegan diets for several years, to eat some "clean" and minimally processed animal foods as their body needs point out to them.
I currently eat health food store butter and free-range eggs as well as deep sea salmon. I don't drink milk, though I will occasionally have some organic, raw milk cheese or yogurt made from cows that are pasture fed and not injected with antibiotics and hormones. I try to avoid all supermarket dairy products. In September of 2002, we added grass-fed, organic beef to our diets. I eat these animal foods when my body tells me I need them. I'll go for days (and sometimes weeks) without an egg, and suddenly I'll know by a strong craving that I need some eggs, so I'll eat them until that feeling goes away. Ditto for fish. Ditto for cheese. Ditto for beef and chicken.
The ovo-lacto vegetarian diet (plants and eggs and dairy) seems to me to be an excellent choice for those who wish to avoid eating animal flesh."