What if a psychiatric patient went on hunger strike?

Let's assume the individual has no diagnosis related to eating disorders.

The Thud or Rosenbaum experiment shows how normal or sane behaviours can
become so easily deemed pathological in the setting of a psychiatric
ward. A hunger strike could be deemed pathological just like a
black-skinned slave who kept on running away might be judged
pathological when it was, in fact, sane behaviour.

What would be the decision or the factors which a person would use to
consider this risky behaviour pathological or not?