Fasting can be an interesting experiment. I don't believe there is anything to gain from prolonging the experiment, but everyone should try hunger once in their life. Definitely a valuable experience. Good job giving it a go. My first true experience with hunger was from my first week as a bachelor living on my own.
Going off on a tangent about diets since people brought it ... Healthy regular meals that give the body enough of the right nutrients at regular intervals is the way to go. Coupled with sensible exercise and sufficient rest keeps people in shape. Stay away from diets that call for low calorie intake or limiting yourself to certain kinds of food. There are no shortcuts to fitness, there is only the long haul. Muscles take years or decades to develop not weeks. Staying thin is a lifestyle not a 3 week diet.
Back to fasting, I disagree with hunger being some far out there fantasy scenario. History is full of long and short periods of limited access to food. It's not a question of just one or two major famines in the last hundred years or a phenomenon limited to third world countries. There have been many wide spread famines and they have hit developed countries as well.
http://en.wikipedia.org/wiki/List_of_famines
Then there are the economic reasons that deprive people of food as well as local failures of the distribution grid. Not every child in North America today gets enough to eat at home. This is not fantasy, this is reality. They certainly do not get a healthy balanced diet... That creates it's own problems (google the link between diet, health, brain development, violence etc etc) but I digress. After natural disasters you of course get grid interruptions that cause short term food delivery problems. So I don't think it's right to call hunger a fantasy.
The often quoted ability to go 3 weeks without food is out of touch with reality IMHO. The modern person is not accustomed to that kind of hard living. It's like asking a couch potato to run a marathon cold turkey. Not going to happen and while you can go for a while without food you will be operating at a significantly diminished capacity. If you are unaccustomed to fasting it will be hellish.
In terms of wilderness survival, which as codger rightly pointed out is usually short term in nature, you do not need a huge supply of food. You get food by getting unlost, you just need enough to keep you thinking clearly under strenuous activity a bit longer than planned. For day to day living I think you would be crazy not to have a moderate buffer of food as an insurance policy. The red cross recommendation of having 2 weeks of food on hand is about the absolute minimum, yet studies show most people are only 3 meals from anarchy. Crazy.
Food, water, shelter. In no particular order since you need all of them.
Did I answer the question?
