I have recently learned that personality (and mental health) can be significantly influenced by the bacteria in a person's gut. This phenomenon is referred to as the gut-brain axis and seems to be primarily controlled by the vagus nerve.
So who are we really? Is our gut microbiome a part of ourselves or should we view it as yet another environmental stimulus that influences our decisions? It must be noted that the composition of this internal microcosm, as opposed to the environment at large, is highly correlated with diet, and as such, we have some control over it. Therefore, it appears healthy eating habits can result not only in physical benefits but also mental ones as well.
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