“Research suggests that people aren't good at recognizing when they've hit an unhealthy weight. That's why they need an outsider to tell them.”
Doctors are the best people who must tell their patients if they are already obese. According to a study, it's very important for physicians to tell their patients if their BMI puts them in the overweight or obese category, even if it would seem to be obvious.
Patients though sometimes stubborn have more tendencies to obey their doctors in medical scrubs uniforms and thus helping them to stop their unhealthy habits compared to those patients who were not told by their doctors.
This is a good sign that doctors can still make a difference, eh. In fighting obesity, we need to listen to people especially those wearing medical scrubs uniforms.
More info:
Did Your Doctor Call You Fat?