I don't understand how my friend can eat a lot of junk food and still be in great shape?

She can eat a lot and still have abs and I'm just like wtf!!! For example we'll go out to breakfast and I'll be a little bitch and order eggwhite omelette and home fries, and she'll get eggs, sausage, oatmeal and fucken pancakes! And I'm. Just like wtf!!!
I don't understand how my friend can eat a lot of junk food and still be in great shape?
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