What I'm talking about is taking a group of people all from different diet backgrounds, some with diseases and conditions, some healthy, some on prescriptions drugs, all ages etc and put these different people on a rather strict diet, one of the diets that is touted as healthy, for at least a few years and see what happens. It's surprising how this would probably be one of the most beneficial studies for human health and well being that could be done, and would not cost anymore than the cost of food which people have to eat anyway, yet it will never be done.