Why are overweight guys encouraged or told to get fitter/stronger and lose weight, but overweight girls are told they're just pretty the way they are?

We see this every day online, including on GaG and Facebook and Instagram. What do you think?

Why are overweight guys encouraged or told to get fitter/stronger and lose weight, but overweight girls are told they're just pretty the way they are?
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Why are overweight guys encouraged or told to get fitter/stronger and lose weight, but overweight girls are told they're just pretty the way they are?
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