When doing construction work, especially in cold weather, or hunting in cold country, you can eats absolute tons of food of all sorts, not gain weight or fat, and still feel hungry, you burn massive amounts of calories in hard work and cold temps. I agree one of the hardest things on so-called modern people is the lack of much physical activity and abundance of food of all sorts. Balance those factors, intake and activity, and I dont think what one eats is much of a problem.