I think people can solve this problem by observing people who they think might have an eating disorder. You should start treating them really nicely. If they have any symptoms of an eating disorder than you can talk to they and see if they need help.

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     If someone has an eating disorder maybe they were getting called fat, and that's why they have the eating disorder. You could talk to the person that was calling them fat and tell them what has occurred, and hope that they stop. Shortly after the person that has the eating disorder should be able to get better easily.