I studied Marketing and Advertising in college where I learned how these people target specific audiences (large and small) . Share knowledge of how to properly identify propaganda, look up some videos online. It's baffling and a bunch of good content. They must decide for themselves whether they want to see through the bullsht or not but I think showing them advertising/propaganda techniques is a good place to start.
Coming off a recent keto experience of 7 weeks. Felt great mentally but my heart rate began to change. My resting heart rate increased about 5 bpm and would have high HR (>100 bmp) when going up stairs. As soon as I reintroduced carbs and natural sugar, I returned to my baseline levels for RHR.