I doubt it has the willpower to eat healthy, probably subconciously it feels guilty for being fat so tries to eat a few salads etc. like most garbage bags full of mayo and wants to validate its super healthy choices by sharing it (cos sharing on social media amplifies the effects of going to the gym and eating healthy), but like you say doesn't want to scare off the o-beasts that follow it using her actions to justify their own shitty lifestyles.