This is answer 4A in "BizQuiz: Working with overeager horse owners."
4A. Right. With so much information available to clients, it pays to stay informed. If the sources seem good, look into them. Ask your colleagues if they're familiar with this information, and find out if a reputable source provides or supports the site or source.
If the information isn't good, tactfully tell the client why. Then offer other sources your client could turn to. Your eager-to-learn client likely won't change, so your best approach is to influence the quality of information they read.
Let clients know that together you'll come up with information that's accurate, reputable, and applicable to the patient.