Why do people think that binge eating disorders aren't actually considered eating disorders?

I see a lot of girls who are considered fit have binge eating disorders and they would eat food that can literally serve 4 people , so why do people don't take this as a serious eating disorder? People who are overweight/underweight have eating disorders although they might be different but still they can be both unhealthy but people often focus on underweight people

Why do people think that binge eating disorders aren't actually considered eating disorders?
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