Fat does not make you fat.
It takes almost as much energy to catabolize fat as you get out of it.
Sugars, on the other hand, yield multiple times more energy than it takes to catabolize them.
Low-fat diets are a dangerous superstition because fats are the building blocks of hormones and can lead to serious hormone deficiencies, especially in the young.
That is weird. People who need a massive amount of calories to survive eat massive amounts of fat, and it seems to work.
We are talking over 10,000 calories a day.
Hard, physical labor and the requirement for heat production in sub-zero temperatures.
Massive amount of fat intake.