On weight management,
… The mean weight loss reported in the five studies indicate that hypnosis can more than double the effects of a cognitive-behavioral treatment. … The data also indicate that the impact of hypnosis increases over time, suggesting that it is especially useful for long-term maintenance of weight loss.
Kirsch, I. (1996). Hypnotic Enhancement of Cognitive-Behavioral Weight Loss Treatments – Another Meta-Reanalysis. Journal of Consulting and Clinical Psychology, 1996, Vol. 64, No. 3, 517-519