"I'm concerned about liability issues" - what kind of liability are you asking about: moral, or legal?
IMO, morally you should give the best advice you can (or, failing that, none): which will sometimes be 'see a doctor', and sometimes something else.
Given the question it would be a bit of a joke to be asking the community for legal advice, wouldn't it.
More recently, What foods do you consume after biking to retain energy?What foods do you consume after biking to retain energy? seemed to me too close to being a question which wanted a serious medical answer.