How many overweight and obese doctors and nurses are there? They’re only slightly healthier than the general population: https://www.fiercehealthcare.com/healthcare/why-don-t-doctor.... Smart, educated Americans can’t force themselves to limit their eating. But in say east Asia, extensive social shaming over weight helps people stay slim.
Humans didn’t evolve to be libertarian sovereign individuals. They’re members of communities and their welfare can be increased by allowing community reinforcement of good behaviors and decisions.