They also clearly have some impacts on metabolism. It’s well known that a challenge with dieting isn’t just eating less, it’s metabolic changes that make weight loss harder. GLP-1’s avoid that.
> metabolic changes that make weight loss harder
Which are vastly overblown. I diet every year as part of bodybuilding, at a range of intensities and durations, and have never had issues with sudden metabolic changes that make it harder to lose weight.
They do slow down the metabolism, yes.
They seem to also act on some reward mechanism - making some stuff (not just food. Alcohol, gambling, porn, smoking, other drugs have anecdotally been reported to feel less attractive / addictive) have a reduced pull on one's will. They also measurably delay gastric emptying - to the point that some medicines, meant to be taken on an empty stomach, are not safe to take within up to 3 hours from the last meal, compared to one hour or so for other people.