What are the disadvantages of a vegetarianism or a vegetarian diet?

Question

i need it for our report and its about vegetarian diet and also macrobiotic diet

Answer 1

you don't get enough protein if you're not careful. I was a vegetarian for a while but I ate fish. Make sure you eat things like beans or nuts to get your protein. And make sure you don't just eat fries instead of a healthy meat choice. That's just stupid.  

Answer 2

Animal protein is complete protein but vegetable protein is mostly incomplete protein.  Iron and vitamin B12 can also be a problem.

To be a healthy vegetarian you have to do it right and some people do it wrong.

You can find further information in web searches for "vegetarian diet" + "health hazards", vegan + "health hazards" and "macrobiotic diet" + "health hazards".