tbh most psych units I've worked don't even do that kind of ED. We'll do BED in a pinch but anorexia nervosa or bulimia with significant weight loss is either stable enough to be managed outpatient or unstable enough that it needs either medical hospitalization or a specialized unit. I've worked one psych unit that could handle telemetry and they wouldn't have liked having to.
Maybe this person has a food related disorder, like "apples are the only things I can eat" and eating a tomato thinking it's an apple might help in a way ?