The FAQ is not specific about the extent to which medical-advice questions are appropriate at Fitness & Nutrition. The FAQ does prohibit vague or unanswerable questions, overly local (personal) questions, and subjective/argumentative questions; as such, there are criteria to close some medical questions. A well-formed question of general interest that nonetheless requires some form of medical decision-making could be problematic.
A recent question here on meta raised the possibility of new close criteria - so this is NOT a question about new close criteria. Rather, I'm asking how the FAQ should be amended (another user here suggested asking this question).