The frontal cortex is an incredibly interesting part of the brain - ours is proportionately bigger and/or more complex than in any other species.
Robert M. SapolskyDigestion is quickly shut down during stressโฆThe 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