>"How would you approach trying to determine a good approach to healthy eating for most people then?" I wouldn't. As noted in my response to falcolas' response

>"How would you approach trying to determine a good approach to healthy eating for most people then?" I wouldn't. As noted in my response to falcolas' response to you I would assume everyone can have different approaches to the same problem. Breaking it down to subgroups doesn't really help that you are still going to be studying an average person that doesn't exist.