Don't know what 7stone is, but yes I agree with angelica. If you are below that, yes you can get some serious problems from being underweight -- malnourishment, which can cause anemia, vitamin deficiencies, which can affect your heart and your reproductive organs. If you have a problem with anorexia you can die from complications because left untreated it will affect your internal organs. If it isn't anorexia and you can't gain weight you need to see a gastroenterologist to see if you may have a malabsorption issue or some other issue. It's not something to toy with. It will also affect you neurologically which can affect your mental status and eventually your ability to even help yourself because you won't think clearly.
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