This post summarises a couple of things I stumbled upon. While browsing Wikipedia, the page on peptides actually contains this:

It has also been documented that, when certain food proteins such as gluten, casein, egg protein and spinach protein are broken down, opioid peptides are formed. These peptides mimic the effects of morphine, and those who are unable to break them down will experience mental illness. These peptides are quite short and are given names such as casomorphine, gluten exorphine and dermorphine.

What proof have they got for that? peptides are basically like proteins, but simpler. It's not alltogether clear where one category starts and the other ends.

Science Blog speculates that obesity may be contagious, via a virus.

Same guy behind that obesity stuff though. More sources needed.

Lastly I read a claim on Slashdot (How's that for trusted sources :-) that 90% of autists are of blood type A. Sources needed!

(First posted Jan. 31, 2006 12:12 am)

Some may throw up their hands at this increase in autism and feel despair and pessimism. They may feel that the future is bleak for all of these newly diagnosed cases of autism. But I remain optimistic that for a good proportion of them, it has never been a better time to have autism. Why? Because there is a remarkably good fit between the autistic mind and the digital age.

Read more: THE WORLD QUESTION CENTER 2007 — Page 7

(First posted Jan. 3, 2007 1:27 pm)