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In regards to why NLP might get the NIH into difficulties, this 2012 systematic review of NLP effects on health outcomes: "Conclusion
There is little evidence that NLP interventions improve health-related outcomes. This conclusion reflects the limited quantity and quality of NLP research, rather than robust evidence of no effect. There is currently insufficient evidence to support the allocation of NHS resources to NLP activities outside of research purposes."
After 40 years of NLP, for 'insufficient evidence' you can read 'substantial evidence that it makes no difference to outcomes'. This is because of the 5 clinical trials that the authors considered worth including, only one showed an effect. Which in turn means that concerted efforts to produce an effect failed 80% of the time even after decades of practice and refinement.
There is little evidence that NLP interventions improve health-related outcomes. This conclusion reflects the limited quantity and quality of NLP research, rather than robust evidence of no effect. There is currently insufficient evidence to support the allocation of NHS resources to NLP activities outside of research purposes."
After 40 years of NLP, for 'insufficient evidence' you can read 'substantial evidence that it makes no difference to outcomes'. This is because of the 5 clinical trials that the authors considered worth including, only one showed an effect. Which in turn means that concerted efforts to produce an effect failed 80% of the time even after decades of practice and refinement.