If breast reduction is all about getting rid of the excess weight on her chest because it hurts her back, why is it okay to be grossly overweight?

I don't get it. Having an extra 10 pounds on your chest hurts your back but, having an extra 150 lbs. on your entire body is no problem at all?

If breast reduction is all about getting rid of the excess weight on her chest because it hurts her back, why is it okay to be grossly overweight?
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