Can we just talk about how daft it is to send in a question to an advice column to "understand the science" around weight? I'm not aware of Amy Dickinson being a scientist who specialises in that field, or even having scientific training in general. That's certainly not the kind of question she usually answers.

The inappropriate target reveals, in my opinion, that this was in no way a genuine question. The LW expected Amy to tell her that she is right and maybe give her a gentle wrist-slap about being judgemental, at best.