Not Medically Necessary

To whom it may concern:
It is my understanding that certain insurance companies will not cover any form of weight loss treatment because it is "not medically necessary". I have to wonder, however, when does it become medically necessary? Is it when a person develops type 2 Diabetes because of a weight problem? Or when a 25 year old develops hypertension and has a stroke or heart attack? I have to wonder, do you really care about people if you won't help prevent these things from happening? I understand that most people believe that a person should be able to control what they eat, or be able to get adequate exercise. What if a person has an eating disorder? If a person goes to the dr. with anorexia or bulimia and is severely underweight? That person gets help because their problem is dangerous. When a person goes to the dr. and is severely over weight, that person is told to " just have some self control" or "just lose weight" or any other ridiculous comment. If a person is over weight, it is because they obviously can't JUST lose weight, or JUST have some self control. That mindset is ignorant and ridiculous. What I gather from all of this then, is that a person with say binge eating disorder, cannot get the medical help they need and are told to just lose weight (which is only a small part of the problem in this case by the way) Would it not be easier and less risky health wise, to help solve the problem so things like diabetes, heart attack, and stroke did not happen in young people? I suppose it doesn't matter to some people. I mean, you are not the one who is sick, so why should you care?