Yes, you will live for three weeks without food, but how well will you function? Not to mention the warmth it offers in cold weather or hypothermia situations.
This documentary shows Australian SAS selection process.
http://www.youtube.com/watch?v=XC7OVRTihV8After a few days of no food, limited sleep and carrying pack weights similar to the 'all guns and no groceries BOB crowd' all day, they even have trouble constructing a triangular shaped coup for someones Bermuda chickens.
And we are not even talking about an environment where hypothermia is a real issue.
They end getting a reward meal that would make a billy goat puke and they shoveled it down with enthusiasm!
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