Gut is technically outside the body as the body cavity folds around the gut during embryonic development. Mind is not quantifiable. Mind is not containable in our mortal bodies. Mind has a deep affect on functioning of body processes and cells. Brain, GUT and Mind are a complex circuit. Our life's experiences (current or past) will shape the way any new situation will be perceived. This will shape our mind and hence our brain which in turn unleashes this data onto The GUT via a complex circuit of nerves as well as some circulating chemicals in the blood. Stress can raise the level of inflammation in the body and increase gastrointestinal permeability also called the Leaky Gut. Stress can also bring on flares on Ulcerative colitis, Crohn's and make pain worse in IBS. Just a note IBS and IBD are not the same. IBS is Irritable Bowel Syndrome and has more stronger Brain Mind connection than IBD. I have seen cases of IBD and IBS co-existing together. In those scenarios both the issues have to be addressed.
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