Being pretty active myself?
I can put down a Wendy's triple cheese, dragged through the garden,
a double cheese same way, the largest fries they have and a large drink, just for lunch.
(I don't eat breakfast)
I snack all day on anything that don't bite me first.
Dinner for me can feed at lest 2 people for a day!
Then snacks till bed time.
So 5 or 6 lbs of food a day for active servicemen,
under stress, is not unusual.
And I only tip the scales at 155 lbs.
(168 lbs when I was in the 82nd AirBorne)