In a first-of-its-kind study, researchers have trekked to several remote Tibetan Buddhist temples to study the gut microbiomes of meditating monks. The findings suggest the long-term practice of deep meditation could positively impact gut bacteria composition.
Buddhist monk microbiome study reveals impact of meditation on gut bacteria

This cannot possibly be surprising. Would you prefer to live in the gut of a stressed person running from appointment to appointment or one who spends time in meditation and is centered?