"Two kinds of microbes, Coprococcus and Dialister, were missing from the microbiomes of the depressed subjects, but not from those with a high quality of life. ... They also found the depressed people had an increase in bacteria implicated in Crohn disease, suggesting inflammation may be at fault."<p>Ties in with this thread from a few months ago:
<a href="https://news.ycombinator.com/item?id=18750985" rel="nofollow">https://news.ycombinator.com/item?id=18750985</a>