
Your experiment is very useful and I think everyone should do one. Not that you will do foodless trips, but just to see what running out of food on a backpack trip would be like. Then you can make an informed decision on the amount of food you take on your regular trips. I take no "extra" and the goal is to come back to the car empty of food. Food is warmth so I am more conservative on shoulder season trips and have sufficient food for an unexpected waiting out a storm. And those with blood sugar issues (such as pre-diabetes) or extremely low BMI to start with, should be a bit cautious about this "experiment"- perhaps doing it at home.
I used to carry dog food in my car as emergency food. Some friends in college ate dog food for a month to save money. Not bad if spiced up.