I have a bad habit of looking at scientific articles on obesity, which usually leaves me feeling very depressed. But I happened upon this recent study that was quite hopeful in some respects, so I thought I would share.https://academic.oup.com/ajcn/advance-article/doi/10.1093/ajcn/nqaa086/5835207
I'm not scientifically or statistically trained, but the upshot appears to be that metabolic adaption is small (~50 calories on average) and goes away within a year or two. Also, the degree of metabolic adaption did not appear to predict the level of weight regain.
To me, that provides some hope that its not a case of battling your body forever - rather, if you can do it for a year or two, it ought to get easier after that.
(I realise that its not very scientific of me to cherry pick a study with a result I like, but I'm not a scientist, so I'll take my hope where I can find it!