It would be entirely consistent behavior for the legislature to merely make eating disorders against the law. That would curb the problem, much like it does with drugs, prostitution, and so on.
Maybe they’ll take the tack of smoking and merely ban purging in public places.
Instead, they’ll just compel insurance companies to cover them in a fashion the government dictates, which will cause higher insurance rates, which will then require more government intervention at the Federal level.
Note that there are Republicans co-sponsoring the bill. Funny how small government principles fail in lots of small ways. Like encouraging government intervention for just this one little problem.