There probably never will be a consensus. Between private corporations funding research that will result in studies that say whatever they want them to say, and differences in individuals due to genetics, or epigenetics, we are completely unequipped to do anything other than use simple heuristic. You need to rebuild society to get accurate studies on this, and outside of that, you just have personal experience or whatever other methods you would employ.
Sugar was good for you before it was bad for you, so were cigarettes, and a dozen other things. For a time cigarettes were considered to be like weight training for your lungs. We don't do real science, we just have a system that allows some to believe that we do.
Human nutrition is a subject that has barely been studied, and most of the studies on it are done by people who have a bias toward certain outcomes.