That hamburger isn't enough calories for a day. Even two wouldn't be. You wouldn't be getting enough choline or fiber and the fat content and types would be a bit off. You can get close to soylent for 3 a day using subsidized products like corn and milk along with a multivitamin. But getting enough choline without getting too much of something else is quite hard without lots of soy lecithen. We can't even define what a natural diet is. It varies from region to region but what doesn't vary is that none of those diets were optimal. They were just what we could get in the area we lived in. I like this project because unlike sugar bomb meal replacements that were already out there it is all about what your body needs long term. We don't know what that is yet but experimentation will get us closer than looking at historical diets due to the aforementioned reasons.