I don't think members of American's dominant culture today have any real conception of real hunger, and its effects upon the human body. With proper hydration, people can go for months-to-years with very little caloric intake. As I showed pointers to above, the ration diet was 500 calories/day/adult, and the article I provided went into some detail on the scavenged root/berry/tasty rocks and bark diet that sustained them "enough" so that only tens-of-thousands died....
I wonder, what's the longest people here on the SLF have gone without food?