dr. greenburg's methods, there is no proof that the hypnosis weight loss works, and still there are scepticsit is not that you're saying it is a crock? >> not at all. it is unproven. it works for some, doesn't work for all and the studies do show that you have to want to believe. you have to believe it is going to work for it to work. and that goes with hypnosis and also goes with any type of change that we make in our life. >> reporter: so it is a bit of a self-fulfilling prophecy. if you believe it won't work for you, it won't work for you. >> that is what we see. the people the most motivated, they want to have success, almost as much as they choose it, it produces a calorie deficit. >> reporter: julie took it a step further, visualizing things like pushing away her plate or eating just have the meal. it is the kind of technique that jenny craig says is crucial to the program. to help avoid the pitfalls. i interviewed valerie bertinelli about it. >> i would come home, make myself a big box of food and cranberry and watch the tevo. >> reporter: and mind-feeding is the flip side of hypnosis