I thought I posted something about yogurt and behavior earlier, but I couldn’t find the post.
He fed mice with a probiotic bacterium called Lactobacillus rhamnosus, often found in yoghurts and dairy products. The bacterial menu changed the levels of signalling chemicals in the rodents’ brains, and reduced behaviours associated with stress, anxiety and depression.
…Bravo found that his mice, after regularly eating Lactobacillus, were more likely to spend time in the exposed parts of a maze (a common test for anxiety symptoms) than those who ate bacteria-free meals. They were also less likely to drift motionlessly when plopped into water (a common test for depressive symptoms). And during stressful situations, they built up lower levels of stress hormones.
Lactobacillus rhamnosus is also the organism used in this peanut allergy study. It is found in some brands of yogurt and kefir.
I think that the human microbiome is one of the most interesting areas in science…