lots of ways to not let myself succeed at anything.

That seems like a different problem...

To remind myself time and again, until my brain learns and understands it: without a change in diet (or lifestyle) there is no change in weight.

back to this - if that's what you are trying to do - have you tried signposting yourself; in places that you will see?

There was a movie "hollow man" where the main character had a sign above his desk so when he lent back in his chair and looked at the roof he saw it, it said "get back to work".