[oyvindeh]

The blog post does conclude with exactly what you say: "What can we learn from this study? Are vegetarians are more likely to be neurotic sick people looking for dietary cures for what ails them, thus come out of the study looking more skinny, unhappy, and unsatisfied? Or are vegetarian diets nutritionally bereft leading to health problems, mental health problems in particular? We will never be able to get that answer from a study of this design."

[yamalight]

Yeah, author does mentions that the study doesn't answers those questions. Still, I find the fact of writing a whole post based on one point, from the paper that seems to be pretty bad at specifically this point, to be disturbing (and sadly quite representative of modern journalism/blogging scene).