Should Health Insurance Cover Eating Disorders??

So this weekend my roommate and her sister were getting into a heated discussion regarding disease types like eating disorders and alcoholism and whether these things are actually considered diseases or weaknesses. I think it is fairly clear, or at least to me, that clear cut diseases such as MS, Parkinson's, Type I Diabetes, kidney disease, and other chronic diseases should be covered through medical insurance because these people have not done anything to cause these diseases and they should not be punished because of things they were born with. The argument that my roommate and her sister were having is that my roommate as well as I see these diseases as not being in the person's control and should be covered through health insurance. Her sister believes that things such as eating disorders and mental illness are weaknesses and personal choices that people make. For example she believes that alcoholics have the choice wether or not to drink and they are simply being weak and therefore health care companies should not be required to cover their illness.

I have mental health issues that have run through my family so I again don't have an unbiased opinion on the matter and I don't see things such as eating disorders and mental illness as a choice and therefore should be covered by health insurance. I think these illnesses fall under the same category of "pre-existing" conditions and therefore they should not be able to be prejudice against when seeking insurance. I think that sometimes people overestimate the power people have over their brain and therefore I don't see it as a weakness. I was look at a website discussing health care issues which gave me more insight into eating disorders and how people who suffer from these already have enough struggles and don't need to have the added pressure of trying to find insurance. What are your thoughts on the topic? Do you consider these illness, diseases or weaknesses??