Bulimia was never proven. Even Schiavo had to admit to that. You'll have to come up with something else.
Michael Schiavo, 1/2000 Direct Testimony: states bulemia was never proved see p 27. (large file)
It doesn't have to be "proven," especially by the standards you have set.
There's more evidence for bullemia than there is for Schiavo physically harming her.