I'm probably overthinking it / projecting my younger self onto Emily because I used to have eating disorders... But I noticed that she mentioned she was drinking coconut water when she was getting her 10k steps in after the pizza. Coconut water is a good source of electrolytes after making yourself throw up.
It just set off alarm bells in my head seeing her eat such a high calorie cheesy pizza and then the next scene she's getting 10k steps in and drinking coconut water. But again, I'm probably paranoid!