[dtmaurath]

This is it! Well based on what I have learned across books and podcasts, namely Dr. Andy Galpin's discussion with Andrew Huberman, Ultra Processed People and Racing Weight. The shutdown of these systems is believed to give them a break and is one of the reasons that regular exercisers have better health (just think why is exercise even healthy? It wouldn't seem so. Spike cortisol, burn a ton of energy, stress joints, jostle around the organs. Seems bad to me but of course its not).

Or you can find out for yourself. Touch your stomach during a run on a hot day. Its cold. Digestion is slowed and blood pulled away from the gut.

N of 1. But I do not eat much more on the days I run 15 miles on the trail vs days off. I do not need to due to these adaptations.