Are Saunas Good for You?
economist.com
economist.com
From general systems biology perspective everything that moves body metabolism away from it's normal state for short time seems to give benefits, exercise, cold, heat, hunger, ... allostatic load that is not chronic is generally good.
Sleep deprivation? Extreme stress?
They are comparing the health differences of the number of sessions, using only people who claim to do sauna at least once a week over 20 years. They have nothing to say about lower frequency or no sauna at all.
> The only way to get to the bottom of the issue is to do more and bigger RCTs until reproducible findings emerge. Until then, expect some heated debates.
Added the emphasis on that penultimate word. I'm pretty sure the word wasn't chosen accidentally.