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Here are a few formal research studies on hypnosis and weight loss.
Study One: Bolocofsky, David N.; Spinler, Dwayne; Coulthard-Morris, Linda. Effectiveness of hypnosis as an adjunct to behavioral weight management. Journal of Clinical Psychology, 41 (1), 35-41.
The first study, published in the Journal of Clinical Psychology, divided 109 people into two groups for a 9 week study. The first group were treated with changes in diet and exercise habits without the addition of hypnosis. The second group was given the same diet and exercise treatment and was also given hypnosis for reinforcement.
What happened after the 8-month and 2-year follow-ups was interesting. The group that did not have hypnosis did not lose any more weight and in fact most gained most of their weight back. The hypnosis group, however, continued to lose weight during both intervals and the studies showed that far more people in the hypnosis group met their long term weight loss goals.
Study Two: Kirsch, Irving Hypnotic enhancement of cognitive-behavioral weight loss treatments–Another meta-reanalysis. Journal of Consulting and Clinical Psychology, 64 (3), 517-519.
Even more importantly, over the long-term the average weight loss increased to 250% with hypnosis - indicating again that the effects of hypnosis seem to compound over time.
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