Hi @TooOldandTired, I could've written your post as well! I've even posted here in the past (under different names), with either no responses or predictable results.
I'm 48 and I've hit my highest weight ever (15 and a half stone at 5'3", BMI 39). I've successfully lost weight 3 or 4 times in my life, starting when I was 20. I know perfectly well what to do, but the emotional pull and comfort of all the lovely, sugar-filled, carb-laden, calorific, endorphin-producing feelgood food is just too overpowering - more powerful than the desire to not be fat. I'm a binge eater and I hide food. I don't know for sure how that dysfunctional relationship developed, but I don't think it's coincidence that my brother was also previously very overweight - but he found a young beautiful wife, lost his weight by existing on toast and coffee for a year, and keeps it off now by eating 800 cals a day and running 3km to and from work. He still has a poor relationship with food, he's just thin - and has high cholesterol with it.
My blood sugars, blood pressure and cholesterol are all fine - nowhere near being pre-diabetic, Christ knows how. My joints don't ache really, I walk 1 hr daily - and briskly - with the dog. But I do have the first signs of fatty liver, and my skin hurts all over which makes me wonder about the infamous cell "inflammation" from poor diet.
I've read all the books and tried all the diets. I've been idly scoffing absolute shite from being bored WFH, and when I actually dared get on the scales the other day, I felt utter shame. I've given myself a talking to, read the Fast 800 diet by Michael Moseley, and read about how a diet heavy in sugar can lead to dementia. I saw my mum decline with dementia over 2 years before she died last year in lockdown, and the thought of my DH having to care for me as my brain shrinks thanks to my shitty diet, scares me far more than any of the other conditions triggered by obesity.
I've stayed away from crap food for a whole 4 days and I'm 1.5 lbs down already. I don't know if I can sustain it but right now I'm in the zone. It has to be about changing our habits, learning new routines - not "going on a diet", like we have umpteen times before. Just got to stick at it - my somewhat thin) brother says "Choose your "hard" - staying fat is hard. Eating better and resisting the addiction is hard."
He also says that he chooses discipline over motivation, as motivation comes and goes - but discipline is a choice.