I think that the question is definitely a personal medical question, and I just VTC'ed it.  In addition I included a comment, because I think it's rude and not helpful to the OP if we don't give them a little more.

Further, even if this question was taken in its general sense it should probably be closed for being too broad.  IMO the generalization of the question is "What can lead to reduced appetite in a average adult besides psychological concerns?"

The answer is so many different things it would be silly to guess without more information.  Many of the problems could be easily checked for just by palpating (from a skilled practitioner).

As to the later part of your question, this community does seem to be much harsher on answers than questions, which is probably appropriate.  Bad answers here might have "higher" consequences than on other sites.  Further, by staying "Health" instead of "Medical" (which it seems like there is [some support to switch][1]), I feel like we are implicitly opening ourselves up to these questions.  

I find that when I scroll through the questions on the site, a great many of them still seem personal, and that it would take far more effort than I'm willing to put it to VTC all of them.


  [1]: http://meta.health.stackexchange.com/questions/407/i-think-the-reason-the-site-attracts-personal-questions-is-because-of-its-name