Why am I fat? Because my self-esteem is crushed.

[ZenGum]

A while back I read a book "Magic" by Butler, written early 1900s, part of the Golden Dawn movement.
It started out fishing around for a suitable definition of magic and settled on:

"The art and practise of causing changes in consciousness at will".

It develops this by explaining in terms along the lines of training yourself to make Pavlovian-type associations, and then goes further.

One example in my life is that I get sympathetic nausea. If I even hear someone vomiting the urge to vomit becomes strong. I have found that thinking about lemons fights this (I know, I'm a bit odd) and now whenever I feel sympathetic nausea I know all I have to do is think of lemons and it passes.

I don't know if or how this could help people fighting weight, but it is an example of willing a change in consciousness by a programmed tool.

Maybe every time you eat, you smash your hand with a hammer. Soon, whenever you feel hungry, think about hammers...