"I have resolved that from this day on, I will do all the business I can honestly, have all the fun I can reasonably, do all the good I can willingly, and save my digestion by thinking pleasantly."

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Digestion is quickly shut down during stress…The parasympathetic nervous system, perfect for all that calm, vegetative physiology, normally mediates the actions of digestion. Along comes stress: turn off parasympathetic, turn on the sympathetic, and forget about digestion.

— Robert M. Sapolsky