Thank you to Heal Thyself for the link.

JONAH LEHRER
September 17, 2011

From later on in the article:

The latest evidence comes from a new study of probiotic bacteria, the microorganisms typically found in yogurt and dairy products. While most investigations of probiotics have focused on their gastrointestinal benefits—the bacteria reduce the symptoms of diarrhea and irritable bowel syndrome—this new research explored the effect of probiotics on the brain.

The experiment, led by Javier Bravo at University College Cork in Ireland, was straightforward. First, he fed normal lab mice a diet full of probiotics. Then, Mr. Bravo's team tested for behavioral changes, which were significant: When probiotic-fed animals were put in stressful conditions, such as being dropped into a pool of water, they were less anxious and released less stress hormone.
How did the food induce these changes? The answer involves GABA, a neurotransmitter that reduces the activity of neurons.

For the entire article go to:
http://online.wsj.com/article_email/...home_multiline