The human brain and muscles primarily use carbohydrates for energy.
The body's 2nd energy source is fat. Protein is by-and-large used for
energy in emergency situations brought on by chronic energy deficiency.
Stating these principles chemically, the human brain andmuscles
run on carbohydrates, and in order to utilize fat or protein as an
energy source, the body must first break down and convert fats and
proteins into carbohydrates, which is a far more costly and expensive
way to fuel the brain and muscles than consuming carbohydrates directly
from food sources. The raw meats of ungulates such as caribou
(Rangifer tarandus) contain glycogen, so consuming raw meats may
provide for direct carbohydrate consumption; even so, peoples occupying
Arctic environments incorporated methods of food acquisition
and preparation in order to consumecarbohydrates directly, including
the consumption of marine plants such as seaweed, as well as
fermenting marine mammal parts and birds that resulted in the production
of carbohydrates through the fermentation process