I think its worth bringing up later.

That sounds really unacceptably fat-phobic to me. Also sounds like she’s delving into something that’s well-outside the competency of most therapists. Would she be so bold as to comment on your bloodwork or radiology report? Weight is just as medical and just because everyone fancies themselves to be some kind of dietician because of something authoritative-sounding they read in cosmo… doesn’t mean they know anything worth listening to.

Weight/eating is not a problem area for me but the Lizzo comment still might be a dealbreaker for me. It’s just so full of casual contempt that it would likely break my trust.

As for how you might come across to future clients, isn’t that something you (will) get extensive feedback about through role-plays, recorded sessions and supervision? Isn’t therapy a space where you just get to be however you are without criticism?