Her room mates might be on a involuntary hunger strike.

Actually, fatties do quite well in U.S. prison. So long as it's not a supermax 23-hour lockdown prison. a) End of every chow, they're stalking the skinny inmates as they finish up their meals. "You gonna eat that? Can I have your cake? Can I have your fruit cup?" They'll get really upset and start fights if anyone tosses any food in the trash can. I preferred to trade portions of my food for milk and juice with them. b) Commissary. They can load up on a mountain of junk food and gorge themselves while they have nothing better to do with their time.