Comparing one small homogenous group of people to a very large heterogeneous group of people would require controlling for a rather large set of variables. I do

Comparing one small homogenous group of people to a very large heterogeneous group of people would require controlling for a rather large set of variables. I don’t see that working well. Additionally, when looking at individuals within a single family we find variances where a diet will work for one and not for another, this applies to workout regimens and the like as well. I would say more study is needed across the board.