The CDC is the best source of information for a lot of things, addictions, diseases, and even eating disorders. Check out their website for more info regarding eating disorders if you're curious.
I think in this situation you should first call 911 if you yourself are not trained in the medical field, then don't try to be. Because you could easily make things worse.
Jana will become unfit, since she is not participating in any activity that gives her exercise. Therefore, she must find something that will give her physical activity.
