[thevillagechief]

Yes, but this is literally a study trying to determine whether correlation is causation.

[eru]

I'm not sure they are able to disentangle it from general lifestyle changes someone on a new weightloss drug might want to make?

(However, you can probably compare it to other lifestyle changes people on previous weightloss drugs did. If we presume that going on a weightloss drug at all is roughly the same impact on associated lifestyle change choices.)