Okay, so maybe it's a little over the to call your sister a cow and tell her she's destined to spend the rest of her life alone, but if it's gets her to cut back to five meals and three snacks a day then it's worth it. Someone had to tell her that she can't go around eating everyone's food, and it might as well be a person that she is obligated to love for the rest of her life. This chick and her fat ass can't keep ingesting everything in plain sight and expect to make new friends so this double spaced condemnation of her as a fellow family member was really just a public service.
It might say that she hates her and include a poorly drawn middle finger, but this is a letter that was written with love. The type of shaming that is so disrespectful that it can't help but motivate someone to change their ways. The type of shaming that only a sibling could get away with writing. If this was just meant to be insulting for the sake of being insulting then she would have typed it out like any normal person living in this century would. That's how you know this came from the heart, because the last thing I remember actually writing out on looseleaf was a middle school love note. Penmanship takes time, and the amount of time spent on a person directly correlates to how much you mean to them. Maybe if this farm animal would stop stuffing her face for a second and pen a legitimate response instead of just posting this on the internet then her sister would know that she cares too.