was Angus Barbieri drinking? one thing i realized is that i can go many days without food. what truly gets to you is not drinking. i was on coffee most of the time.
It really depends from where you start from. If you're at 10% body fat you'll probably be dead or in very bad shape after 3 weeks, if you're the average westerner sitting at 40%+ body fat you'll be alive, and probably in better shape, after 3 weeks of fasting.
Probably don't need to get too in the weeds here; it's just a rule of thumb.