I used to work at a pulp and paper mill that had the last company logging crew in the East. They mostly lived at the logging camp during the week and drove home on the weekends. I also worked with a few folks who worked and lived in the temporary logging camps years earlier. I remember one person telling me he got a job out of high school working in the camps. He was there for his first breakfast and one of the old timers pushed a dish of baked beans towards him at breakfast and said "eat the beans" this young guy had never had beans for breakfast so he declined. They then went out logging all day with just a short break for lunch brought out to them. He dragged himself back to camp at the end of the day and figured out he was in for real work. The next morning the same old timer pushed the beans over to him and he took a big helping and woofed it down. The camps always had baked beans and pea soup. The cooks would bake loaves of bread and usually would bake several pies for every supper. It pretty much came down to they ate as much as they could as the combination of 12 plus hours of work along with working in below freezing temps in the snow, they really couldn't eat enough. If you see the old photos of the logging crews there arent a lot of overweight loggers, the only folks who might have a gut are the bosses.
One of the logging operations in Maine has done recent publicity that they have seen a big shift in occupation hazards for loggers, almost all the logging in maine is now with mechanized equipment where the operators sit most of the day in cab, obsesity, diabetes and coronary issues is the new risk.
I hike as a hobby and along the way walked from Georgia to Maine over a period of about 10 years. I met a lot of thru hikers who do it in one year usually in 4 to 5 months. They have what is called the AT Diet, they can eat anything they want and as much as they want, they just have to carry it. Unfortunately many really screw up their metabolism during the hike. They lose a lot of weight on the hike but when hey finish they usually gain it all back as they have lost the ability to feel "full"
For normal hiking the goal is not to eat one big meal rather snack continuously. Folks forget, the digestive tract is very large muscle, eat a big meal and the stomach starts to pull blood away from the extremities, thus the old warning about waiting before going swimming after a meal. Far better off eating easy to digest high glucose snacks. Try to avoid fats and meats as they take a long time to digest. If you are sweating also consider electrolytes in place of water. The easy one is gatoraide diluted 50% with water. I use a product called NUUN when hiking, its an electrolyte with no sugar in it. If I dont use it, I end up getting leg cramps later on that evening.