It's hard, because people are often their own best ad.
Like a tatooist with REALLY bad tatoos on wouldn't give me confidence because why would you have THAT if you know better.
Or a mechanic with permanently broken down car.
Iyswim.
I will sound horrible, but I don't think I would go to them if they were really big. Also because my brain would do the same it did when my obese gp told me to lose the weight... "Erm, ok, good example, eh".
They don't need to be absolutely skinny, absolutely not, but shouldn't be anywhere near obese levels🤔