If (that's a big if) Chantal was referred to a therapist & dietician from her doctor, they would have her medical records.
No one blindly starts treating someone over a phone.
Unless she's calling that BetterHelp place Amber was hawking a while back.
They would know she's over 400 pounds & what serious medical issues she has. A dietician would pull together a meal plan based on her records, not what she tells them in a 15 minute phone call. They would know exactly what she should be eating & portion sizes would be noted.
Getting her on track immediately with a meal plan is their job.
What Chantal is talking about is fantasy.
Actually there's more to it than that. I study nutrition & dietetics, and while you might assume a dietician just comes up with a mealplan and that's it, there's more to it.
Ofcourse I'm not Canadian so dieticians in Canada might be different, but where I live, we focus on psychology aswel.
Persuading a person to change, helping them stay on course and knowing how to push them back if they relapse into old habits is part of a dieticians job too, although not the main focus
What we learn is that we follow the "stages of change" model, which describes every part of a person's "journey" from overweight to healthy weight, and how to steer them in each phase.
She's still bullshitting though, but I do believe there's more to dieticians than just "here's your meal plan bro", since we learn much more than just nutrition. And you're correct that a dietician would atleast come up with a mealplan ASAP, but giving a mealplan to a person who doesn't have the motivation to change is pointless, so part of the study is about the psychology behind unhealthy eating and how to help them mentally to get them in the right mindset.
Which is part of why you have multiple meetings with the dieticians - if they just came up with a meal plan, then why meet them again? Take the mealplan and leave it at that. The multiple meetings is to go over their days, did they follow the diet? No? Why not? And how can we make sure it goes right this time?