Interesting about sauna, I did not know about that.

Why is that? Muscle metabolism?

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In short it is because when you are in sauna, you sweat and dehydrate and your blood sugar spikes.

I can recommend this video about benefits of fasting & time restricted eating. It is really great. At about 2:09:00, effects of sauna on fasting is explained. https://youtu.be/9tRohh0gErM