PBA, you conflated two of my posts.
I don’t want to get into a debate over whether there really is such a thing as a perfect analogy, but I don’t think anyone would find fault with a dentist or hygienist discussing the detrimental effects of candy, or of neglecting proper dental care (as part of, not instead of, a cleaning).
I don’t consider doctors to be malachim, but they are highly educated professionals. The responsible ones (I try only to use these), though not infallible, generally endeavor to come to logical conclusions based on sound research. Their opinion should be respected more than that of people whose conclusions are based on emotions and anecdotal evidence at best. When there is near universal consensus among doctors, this magnifies exponentially the respect which should be accorded the consensus opinion.