I've posted about Dr David Katz before. He is worth paying attention to when it comes to prevention for health care. Another one I just bumped into is Dr Tom Rifai. He has two facebook pages - one for himself and one for his RealityMeetsScience 'prevention' approach to medicine. Both are helpful to track. And I also saw him on a Fox 2 News (Detroit) news segment called: "The Dr Is In" as he spoke with Deena, the host, about Calorie Density (which I've posted on before as well).