Read the article if you like, The current state of psychobiotics, but I really just wanted to share this very well-thought-out diagram of the interactions between gut and brain:
However, probiotics are only part of the story. "Prebiotics (nutrition for gut bacteria) are another channel to alter gut bacteria," Burnet says. "We call for an even further widening of the definition of 'psychobiotics' to include drugs such as antidepressants and antipsychotics, and activities such as exercise and eating, because of their effects on gut bacteria."
Just a guess, but I'll bet ya that when they do come out with prescription "psychobiotics" the ingredients will list things like raw potato starch, Hi-Maize, Inulin, and all the other fibers we've been discussing around these parts for years.
This just out on PubMed: Resistant Starch Bagels Reduce Fasting and Postprandial Insulin in Adults at Risk of Type 2 Diabetes.
These data suggest that consumption of a high-HAM-RS2 bagel improves glycemic efficiency by reducing the amount of insulin required to manage postprandial glucose while improving fasting insulin sensitivity in adults at increased risk of T2D. This research provides support for a feasible dietary strategy for T2D risk reduction. This trial was registered at clinicaltrials.gov as NCT02129946.
HAMS, of course, is Hi-Maize corn starch. Someday, someone will get rich off of RS, creating supplements, drugs, and snack-foods. Until then, we'll just keep chugging along, eating our dried plantains, popcorn, and oatmeal.