I think what you're talking about is that study that came out not long ago, the one about GLP's — Reta included — and how they might dull the dopamine pathways.
From what I could tell, there was some decent science behind it, though my brain isn't exactly well-versed in this stuff.
That said, I did have moments where stuff felt 'less enjoyable' — and I don't just mean food, other things too. It was mild, though. This was a few months before that study came out, and it never hit me in a way that stood out enough to really register.
What's way more fascinating to me is how the dopamine pathway dulling lines up with what's being seen in people dealing with addictions — gambling, alcohol, that kind of thing. That part really grabs my attention!
Now, about all that social media nonsense claiming 'it made me hate my girlfriend' — that's complete garbage. Does it take the edge off feelings a little? The science points that way. But if all of a sudden you can't stand your partner, something else is at play there. Just my 2 cents, obviously.