Peter Attia· MD
the parasympathetic system the way we would always learn to remember this in medical school was this was the rest and digest system so this is the down regulating system it conserves energy it aids in digestion it slows heart rate
The headline is broadly defensible, but the qualifications matter. Effect sizes vary by population, the strongest claims rest on shorter trials, and credible voices push back on how it's typically framed.
the parasympathetic system the way we would always learn to remember this in medical school was this was the rest and digest system so this is the down regulating system it conserves energy it aids in digestion it slows heart rate
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so the sympathetic system of course is the fight or flight system so it's making energy more available it's dilating the pupils right it's getting you ready to see as much information as possible it's slowing digestion and peristalsis meaning it's slowing down anything that's not essential and it's increasing heart rate