It's the mental side of the job (which is actually the most crucial part of the job). Hypnosis is successful in helping people lose weight but it's an individual journey. If you want to know about YOUR potential for success ask yourself how much YOU want the goal and what you are willing to give up and do to get it.
When you're happy to give up your bad habits to achieve success hypnosis can focus you on how great it feels to be succeeding while letting go of the idea of deprivation.