All i do is mention the word:The correlation doesn't surprise me, especially because it's restricted to vegetarians in Austria. Most modern vegetarians don't eat balanced diets, particularly those who are recent converts and living in a country where it's not easy to be a vegetarian. Literally 1% of the original survey respondents were vegetarian.
I think a more proper study would involve generationally vegetarian communities in Asia and Africa, since they are more experienced and their diets are generally balanced due to being around for a long time.
Also, to pre-empt the correlation = causation fallacy that is sure to show up soon in this thread, here's the study itself:
I'd be very interested in seeing the follow-up study, when it comes out, so we can see how many of these people were recommended a vegetarian diet because of pre-existing ailments (which is common enough,) and also the specifics of the vegetarian diets in question. This is important research.
Bioavailability and watch vegetarians flip out.
Even if they were resolved to just eating fish, they'd do much better.