I drew this sequence of Rachel's gluttony and obesity to announce the start and results of the call for requests.
Rachel has the belief that she will eat up everything she is served unless there is something wrong with it, so she sometimes eats up to her limit, as in this case....Also, Rachel herself loves the feeling of a full stomach that feels like it is about to burst, so there are times when she will eat a big meal just to make her stomach growl.