The conclusion I have come to is that humans, when starting from an over-fed modern baseline, are robust enough to eat a totally shit diet for a couple months. This is also long enough to convince us it is worth blogging about.
The subculture of long-distance hikers who optimize by going fast and light (maybe 1-3 lbs food per day plus 10-20lbs of gear). They'll go for months on extremely weird diets that optimize for calories per gram while doing more exercise than they've ever done and generally be fine.
