Every time I've considered how to really do nutrition research, it essentially amounts to a prison, even if voluntary. You would need to be able to lock differ

Every time I've considered how to really do nutrition research, it essentially amounts to a prison, even if voluntary. You would need to be able to lock different populations away from any source of food than what you provide, and control their daily activities, etc, for at least 2 years, though you could likely get some results after only 6 months.