I have many patients who swear by alternative therapies that are unproven or, worse, proven not to work.  How should I counsel them?  On the one hand, each individual is unique and it's possible that what applies to thousands of patients in a study shouldn't be generalized to the specific patient sitting in my office right now.  On the other hand, we all (I included) have a staggering capacity for self-delusion, and it's possible that my patient is just engaging in wishful thinking because he si...