How do I deal with my mom telling people I need to lose weight?

I'm at a healthy weight says my doctor but I used to be skinnier this last year has been hard and she doesn't get that. So see tells me all the time I need to lose weight and she tells her friends all the time. It make me not want to lose weight but just say f**** it! I don't know what to do I've tried telling her but she doesn't listen and it's making me just want to die.
How do I deal with my mom telling people I need to lose weight?
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