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)

Scientists from Johns Hopkins and from the University of Milan have effectively proven that they can inhibit lethal human brain cancers in mice using a protein that selectively induces positive changes in the activity of cells that behave like cancer stem cells. The report is published this week in Nature.

Read more: Natural protein stops deadly human brain cancer in mice | Science Blog

(First posted Dec. 8, 2006 10:44 am)

LaFerla; James McGaugh, research professor of neurobiology and behavior; and postdoctoral researchers Kim Green and Lauren Billings studied hundreds of mice between two and 18 months of age that were bred to develop the plaques and tangles characteristic of the disease. Mice in one group were allowed to "learn" by swimming in a round tank of water until they found a submerged platform on which to stand.

Read more: Learning slows physical progression of Alzheimer's disease | Science Blog

(First posted Jan. 24, 2007 7:55 pm)