As surveys by charities including Action for M.E. and the ME Association acknowledge, CBT, GET and GAT have benefit for some people with M.E. while others experience negative effects as a result. Further investigation is needed to find why it may benefit some people and not others.
Why is further investigation needed? The risk-to-benefit ratio simply does not add up. These "therapies", when they benefit people (which is rare), have a marginal effect at best. They also, according to the charities' own surveys, make a substantial percentage of patients worse. Anecdotally, GET has a proven track record of turning mild patients into severe bedridden/housebound patients. ME forums/support groups are littered with casualties of GET. Why should we spend more of the extremely limited research funds and manpower on investigating these therapies when there are other treatments we could be studying?
If, hypothetically, CBT/GET/GAT were highly effective for a subset (if, say, their efficacy were comparable to that of rituximab where some people return to 100% premorbid functioning), you MIGHT seriously consider whether the risk of further trials is justified given that GET also makes many people worse and we have no way of predicting who is going to be made worse so we have no way of studying only the subset that isn't at risk of a severe and permanent worsening in their condition. But in reality, CBT/GET
isn't highly effective. It's not like chemotherapy where some people achieve full remission and the extreme risks may be justified. We're talking about treatments that produce a modest change in questionnaire-taking behaviour in samples of people with unexplained fatigue with high prevalence of psychiatric comorbidity. Even one bona fide ME patient becoming severely ill as a result of such "research" is an unacceptable risk.
As an aside, in my 20 years of ME, I have met only one person who attributed a substantial improvement in their condition to CBT/GET. He was a psychologist I used to work with. He was a mild patient able to still work full time but with difficulty. Objectively, he appeared constantly tired on observation and was crashing frequently on the weekends according to self-report. He also had polyuria which was being investigated by the GP. Things being what they are, the chances of a GP figuring out he had diabetes insipidus were nil (even though many ME patients are deficient in vasopressin, this information is not in their textbooks since ME is not a real disease) so he was being investigated for things he doesn't have like prostate issues. He also had frequent heart palpitations, insomnia requiring prescription sedatives from the benzodiazepine class, intolerance of coffee, alcohol etc. Yet he felt his life had been greatly improved by psychology and hence decided to become a psychologist. Everyone here can judge for themselves if his beliefs were aligned with reality.
But I digress. The crucial point is the one Ginger brought up. Any purported treatment for any disease must demonstrate biological plausibility. Even psychiatric treatments attempt to do this. In light of research using cardiopulmonary exercise testing by exercise physiologists in the US,
which confirms what ME patients have been saying for decades (i.e. muscle exertion/energy expenditure causes a flare in ME symptoms and DECREASES the body's ability to create energy in the post-exertional state), any study purporting to show a benefit of exercise in this disease, no matter how marginal, can be tossed out as invalid seeing as the very principle of a graded increase in activity contradicts the core pathophysiology of this disease.