I'm having trouble understanding and explaining how obesity is a disease

How exactly is obesity a disease? My understanding is that a person who's BMI is at a number that clinically makes them obese. Got that part...I'm confused...is it a disease because the person cannot lose weight in the "typical" way...the fat just stays there no matter how little or much you eat and no matter what you eat? Is it like a metabolism thing? No or super slow metabolism? Also..not a thyroid problem..is that what makes this a disease? How can I explain this all to "normal" ha..ha.. people so they'll understand why I need this surgery? I know I shouldn't care about what other people think etc..this is just for the doubters in the family and trying to make them understand.

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