Every weight loss lifestyle intervention produces results over time which look like this:
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(Picked at random - it doesn't matter which study - they all look similar: WW, low fat, low carb, whatever. The concrete numbers differ but the shape of the "waterfall" doesn't.)
People like me (and apparently you) over on the left hand side can find it hard to see what the big fuss is all about. But the fact is that anything like smugness over our superior motivation etc etc is completely misguided. People way over on the right hand side very very ofteh show far more motivation, effort & application than we do. It's just that their biology means that they are indeed trying to climb Mt Everest in terms of weight loss maintenance.
On the other hand, all of these programs tend to show *average* long-term weight loss of 5%-10% which is a worthy outcome, clinically.
And also, this is the beginning of the era of pharma solutions to the biological issues: semaglutide, tirpezatide, and a huge pipeline of future candiates.
EDIT: Where I think Taylor & Lean verged a little into crank territory was their apparent belief that *motivation* might be sufficient to preserve weight loss in a large proportion of the DiRECT population. I think that there was a huge body of evidence that this was unlikely to be true, and as it turns out, the 5-year DiRECT results act as a great demonstration that weight loss maintenance depends primarlily on motivation.