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Eating disorders create underweight patients who may suffer from a myriad of problems. These conditions are extreme because their disease is about controlling what they ingest and how much they weigh. Anorexics frequently damage heart, liver and kidneys by not eating enough. They can also lose their hair, experience muscle weakness and joint pain, ultimately, some people have even starved themselves to death. Because Bulimia is about binging and purging, bulimics may have stomach damage from vomiting and damage to the teeth and throat. Most damaging is the potential loss of potassium from constant vomiting that can lead to heart failure, brain damage and death.