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Cryotherapy doesn't specifically stop aging but it absolutely kicks your system into a high production mode that it usually doesn't run in, which can help detox and get the blood flowing, metaphorically. IR sauna I dunno about and neurofeedback just seems like meditation with a edgy name
Cryo and Saunas work because of a thing known as "heat shock proteins". IIRC this isn't a placebo effect. https://en.wikipedia.org/wiki/Heat_shock_protein They have a variety of potentially healthy effects associated with them.
Literally everything you listed at least has a bit of a benefit, though not necessarily for the reasons that they list. Cryotherapy has some benefits, though I doubt any of them are anti-aging. Ice baths can cause browning in fat cells and subsequently cause you to metabolize those cells.
Placebo effect is provable in literally anything
That's the point. That's why it's important to not only test things and not rely on anecdotes, but make sure the tests are properly controlled and blinded, and powerful enough to prove an effect. For things like hot saunas which are next to impossible to run blinded trials on, it is monumentally difficult to properly show there is a real effect on health due to the thing in question.
If there is a real, measurable improvement in health due to the placebo effect, that's literally an actual benefit.
You can not call it "real, measurable" without a controlled environment.
There comes a point where you need to ask whether it is worth people/insurance companies/governments to be spending so much on placebos. Observational studies are often so much harder than double-blind experiments and often not good enough to prove things like health benefits. Throw in publication bias and conflict of interests and you have a black hole for research funding. There is a reason why after all these years and experiments and data, we still don't really know if butter is good for you.
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