Just to flip this around a bit: don't we have evidence from PACE that CGT is not effective for ME/CFS? Isn't this CGT approach to ME/CFS pretty much the same as what's being call brain retraining here?
The PACE theoretical model for CBT, which it has one, despite PACE pretending to be a 'pragmatic' trial, is explicitly a fear avoidance (whatever that means) model based on the same ideas. To be fair, "brain retraining" is a completely fluid idea that means whatever one wants it to mean in whatever context they need it to mean that thing. Like Feng-shui. And it's as scientific as "detoxifying". Actually, has even less evidence for it (toxins are definitely bad for us).
Actually, I was curious and decided to google it. Of course results are tailored to me, but, still, the first page of results is mostly made of commercial websites selling their own version of it (the first result is DNRS, a popular quack program) or media articles promoting it. Going down more pages: Gupta, more commercial programs, ME-Pedia warning about, youtubers selling their own program.
There are a few otherwise legitimate resources in the results, but most of them are influencers or companies selling their program. This stuff is 100% pseudoscience, it's shameful for medicine to not oppose this junk, but since they clearly chose to join alternative medicine instead of beating them, they're only becoming more like them, not the other way around.
It's actually funny, in fact the main outcome of this one-sided merger has been that the alternative medicine quacks simply adopted the language used by health care professionals, but kept the substance the same. So all that medicine has achieved here is promote quackery. This is a truly shameful time for this profession, one that has enabled a truly absurd number of such embarrassments.
