Depends which expert you listen to! The default position was previously that you get down to your target weight having somehow reprogrammed yourself and then stop taking MJ. The problem with this is that this often doesn't work, and a lot of people found that old issues, behaviours, eating disorders returned, and they put weight back on. More recently the talk has been to reach your target weight and then titrate back down the doses to a 'maintenance level' which seems to have been a more successful approach so far. It's noticeable that among some providers, there's been more messaging recently about providing maintenance doses, unlike how things were just a few months ago. That's certainly my plan at the moment.
But quite honestly, there is no simple answer. We are still learning. Trouble is, everyone is different. People have different needs, issues, physiologies, and so it's hard to state what a one-size-fits-all might be. I'm convinced that these treatments are here to stay and that in years to come they will be much more widely available in more convenient forms eg a monthly pill, and they'll be regarded as pretty normal.
If I'm honest, I doubt if I'll read the book. I wasn't aware of it but have just read a couple of unflattering reviews including this one in the Guardian: https://www.theguardian.com/books/2024/may/01/magic-pill-by-johann-hari-review-weighing-in
It was written a year ago which is a long time in GLP-1 history. It's about Ozempic (Semaglutide) rather than Mounjaro (Tirzepatide), and appears to be very anecdotal. I've arrived at my own views after 5 months' experience plus a huge amount of (also anecdotal) reading from users on Reddit, Facebook, even Mumsnet etc. That amounts to as much research as I plan to do. I don't think there's some hidden truth out there that only dubious journos like Hari is party to. What we don't know, I fully admit, is what the very long term impact of these treatments might be but if anything, the news is getting better rather than worse. Mounjaro is now being used to treat a range of conditions ranging from ADHD, addictive and obsessive behaviour, high blood pressure, even sleep apnea. Call me a naive old fool if you wish, I don't mind, but honestly, so far I think it's a great drug with incredible potential. BUT (important caveat), again, everyone is different. Some people get side effects while others experience no food suppression or reduced 'food noise' at all. Apparently 10 or 15% might be in this category. So it's not for everybody.
Whilst that’s unproven conjecture just now, going against the MHRA, what‘s not conjecture is that in the real world now a lot of folk have greatly reduced their odds of type 2 diabetes, some cancers, chronic inflammation and its many consequences, heart disease, chronic pancreatic issues.