I'm studying to become a dietitian, and I was going over my textbook during a slow day at my office.  My coworker comes over (male demi-shitlord, who hasn't realized his full potential for hatred) and is curious about the different facts I'm learning.  He's a very intelligent guy, and takes decent care of himself, so I felt comfortable talking about health and diet with him.  He looked and saw the answer key left over from my scantron test and decided he wanted to test himself.    There were a lot of common sense questions in there, as well as some stuff that only a student of nutrition would know (the names of the different Lipids, the di-/mono-saccharides, etc.).  Despite being a smart guy, he was not able to answer past some of the more well-known facts. The idea soon blossomed in my head that this would be a PERFECT way to "educate" someone who was stubborn about receiving care or following nutrition advice. Give them the most BASIC test (like, first semester shit) without the use of a phone, of course, and see just how well they "know" all of this information.  If they aren't able to answer the questions, "politely" remind them that you've made your life's work out of possessing this knowledge, and perhaps if they aren't informed of these basic principles, that they should be following the advice of someone who is.