That punishes people that are truly ill though too. Not everyone underweight is like that because they have an eating disorder! I'm severely underweight, I'm fed by a tube in my small intestine to bypass my paralysed stomach which was caused by the rare genetic disorder that I was born with. Even with that tube and special, expensive liquid food, I cannot absorb enough to gain weight and am still heading downhill.  I didn't choose this and no matter what I do I cannot fix it at all. It's not like anorexia where treatment could potentially cure me. I am literally incurable. I'm not only slowly starving but I'm severely physically disabled too, meaning I can't work to pay for my treatment. I'm totally reliant on my husband and the English NHS to keep me alive. Then you consider all of those people with things like Crohn's, Coeliac, cancer etc. which leaves them drastically underweight against their will. We shouldn't punish people for being properly ill. It's scary and stressful enough as it is without worrying that your medical care will be cut off. Plus, anorexia is a recognised mental illness that requires treatment to cure. You can't just "stop being anorexic", it takes a lot of medical help to fix it! Many fat fucks would claim the same thing regarding their overeating, sure, but the medical world doesn't seem to agree or it would be listed in the DSM! Make the fatties pay for costing so much, sure... Just don't penalise the genuinely ill!!