Do what it takes to get them to a doctor and let them handle it. For example: "I want to support you, but I am no expert. Let’s see a nutrition specialist to see what the best course of action is. Personally, I think you are not too fat, but if there is something you want to change, let’s do it right.

That’s the beauty. Given that there is no goal, you are able to define your own.

That’s what I call a big update!