Keep in mind that those averages everyone is talking about goes both ways. By that I mean "THEY" say they can find and rescue you in an "AVERAGE" of 72 hours. What if it takes longer, or they just quit looking for you?
Anything can happen, you can be a sleep or in dense cover while a SAR team flys over you and now that area is considered searched, for now at least, and you missed your chance.
It would really suck to be weak and come to the conclusion that they have given up on you. Now you have to find food in a weaken state. I do not see any problem with looking for food right away.
You can not control what everyone else does, but you can control what you do.
Just a thought.