An eating disorder is a psychological illness that leads you to eat either too much or too little. Indulging in a hot fudge sundae once in a while is not an eating disorder. Neither is dieting for three weeks so that you can fit into last year's dress this New Year's Eve.
The difference between normal indulgence and normal dieting to lose weight versus an eating disorder is that the first two are acceptable, healthy behavior while an eating disorder is a potentially life-threatening illness that requires immediate medical attention.
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