This is one of the best articles I've seen on serious research into the link between microbial presence and human mood and behavior.

Not too long and not too abstruse, it discusses a lot of recent discoveries, which of course leads to further inquiries.

http://www.nytimes.com/2015/06/28/magazine/can-the-bacteria-in-your-gut-explain-your-mood.html?smprod=nytcore-iphone&smid=nytcore-iphone-share&_r=0

Great article -- just forwarded around to some friends. Love having learned so much about the Vagus nerve system because of having WLS. And so much more to discover with science making strides at last.

I experience anxiety at times and, while I get it that this guy is not recommending every one go out and get pro-biotics, I am going to start mixing up my lacto-bacilli with differing yogurt combos and some supplementation (Lest I be one of the mice who figures out the swimming isn't worth it or I become a marble burier.)