If you're interested in this do have a look at some of the work on Psychoneuroendocrineimmunology (PNEI for short), emerging understanding of the microbiome, th

If you're interested in this do have a look at some of the work on Psychoneuroendocrineimmunology (PNEI for short), emerging understanding of the microbiome, the gut brain axis, the role of bone-marrow in all of this, for example; Neuropeptides and the Microbiota-Gut-Brain Axis https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4359909/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4359909/ or something a little more mainstream that appeared on HN, "Don’t hate your gut: It may help you lose weight, fight depression and lower blood pressure" http://www.salon.com/2017/07/14/do-not-hate-your-gut-it-may-help-you-lose-weight-fight-depression-and-lower-blood-pressure_partner/ http://www.salon.com/2017/07/14/do-not-hate-your-gut-it-may-...