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Gnosis said:
BMI isn't always right, it doesn't know much muscle you have, and muscle weighs more than fat doesn't it?
But assuming this young girl isn't some weight lifter, maybe she is a tad over weight? I'm really skinny so I'm not expecting anything more than something underweight.

Well technicall Muscle weighs the same as fat, much like feathers weight the same as stones ... Muscle is more dense than fat being that it takes up about 72% as much volume for the same mass.