It's 2 days later, but the effects found in studies are:

- Increased weight gain contain to the same calories in non-UPF - Consumption of UPF linked with obesity - Consumption of UPF linked with early death

As always, I'm sure you could argue with experimental set up, but.those are the main claims.

Source is ultra-processed people, which I mentioned earlier and someone kindly linked to.

Those are correlations found in junk observational studies, not "effects".