Adipose tissue retains an epigenetic memory of obesity after weight loss

There aren't any, statistically speaking. All strategies are about equally ineffective, long-term. Only really expensive, high-touch, long-term personal engagements by professionals achieve really significant results, and even there, less so than you might think.

The answers that actually work are "move to an environment where you will likely get and stay skinnier" (maybe a different, skinnier country) or (this one's new! There's finally a semi-reasonable answer to this question!) "take GLP-1 agonists". There's no strategy that'll do it (for outliers, yes, but over a population, no)