Some people have their cancers cured after they drank their own urine...
Seriously, increasing dietary control will require will power, better food choices (make you feel full for a long period of time), many small meals and maybe an anorectic agent. W
hen eating healthy foods many times a day, it gets rather pretty easy not to fall for crappy foods when you feel so full you can't eat another bite.
Hypnosis is still undergoing lots of research. For obesity control it seems to hold some promise but with the use of Cognitive Behavioral Therapy.
You might want to look into this short clinical review on Hypnosis and Relaxation Techniques from the British Medical Journal.