"Doctors recommend this one simple life hack to revolutionize your grocery budget!" Or something like that.
GLP1 confounds things with the psychological impact as well; it apparently allows for more executive agency, disrupts the impulsive behaviors and cycles people get into, and might allow for some high discipline strategies that the simple calories difference in groceries don't account for.
It's not that there's no interesting questions to be asked, this paper is just awful. Everything about it is bad.