It is sometimes claimed that the multiple personalities of a person with dissociative identity disorder may not only display different character, behaviour, and movement types, but even show different functionings of the body. Quoting,
One example is a boy who endures allergic reactions when drinking orange juice including symptoms such as hives and water filled blisters which subside immediately when he switches to a different personality.
Another mention of (probably) the same case is here. So to be concrete:
Is this particular story correct?
Have there been verified cases of split personalities with significant differences in body function, such as a different immune system, different hormone levels or different physical strength?
While my first link provides some references to publications on this topic, I am uncertain as to whether they represent the scientific consensus, in particular in light of the controversy on split personalities mentioned at this related (and still unanswered) question.
This question was inspired by the movie Split, where this is a major theme.