Why can't an anorexic 'just eat'?

Why can't an anorexic 'just eat'?

I think it's so funny. That's such a powerful question because in my families, when people come in for treatment, by the time they come in to treatment, they've had six months of the parents trying to just get her to eat. Now, obviously, if the person could "just eat", if they were forced and they could "just eat", we wouldn't have this really complex syndrome that has so many intertwining factors that make it to where they attach to it so intensely. So if they could "just eat", then they don't have anorexia. The nature of anorexia is they are unable to eat. So if they're unable to eat, how can they "just eat"?