there is a difference between philosophy, religion and actually
being healthy...
anyway, it is what you believe, and then, there is hard brutal
science...
most doctors who have done research in this say that all you
need to do is to take some organic dairy products like butter, or
take some free-range organic eggs (if you want to make sure, check
if it is unfertilised) once in a while to keep healthy...
but the vegans will tell you these are verboten...
again, do your research without prejudice...
anyway, my aunt who went vegan 20years ago, now has
osteoporosis, a dowager's hump and lots more other problems..
because she went into this without any thought and
half-cocked...
while sticking to your beliefs are to be commended, your
body needs more...
may you all stay healthy... 
Show your aunt who is a vegetarian with such problems, it will
also to bring up people with such problems who are not
vegetarians!
Osteoporosis, is due to lack of bone density, due to inability
to build up bone density. There many reasons, deficient mineral
intake or ratio,insufficient exercise, mainly high impact ones.
Plant calcium and other minerals in the body is relatively well
absorbed without side effects, you won't suffer from lactose
intolerance! Also, a vegetarian is important for blood alkalinity.