I know when I did the mountain man thing for over a year, I consumed about 3 times the calories I do normally, especially in the winter.
Hauling water, chopping wood, and generally working from before dawn until after dark requires a LOT of calories.
My historical research into shopping lists and military ration allowances from the late 1800s confirms that.
/johnny
Most people will not expend the energy soldier/Marines do. They will sit around and take the easiest path.