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Originally Posted by Not devonin

At the extreme top end of Professional Chess, a Super GM will lose nearly 20 pounds over the course of a tournament.

That level of focus, attention, and effort spikes blood pressure, increases heart rate. All of the top players now approach it like a more traditional sport.

They have personal trainers, dietitians, take more care to have downtime between tournaments, it is -very- physically demanding as well as mentally.

Heck, Magnus had a spike in performance by developing a better physical sitting position to put less strain on his neck and shoulders.

I wonder if day long magic tournaments have the same results
could explain a lot