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Foods that generate heat, which are eaten by humans in all extreme cold weather situations, contain large percentages of fat.

For example, early Antarctica explorers ate a food called pemmican, a concentrated mixture of fat and protein. Pemmican is traditionally made by drying thinly sliced meat over a slow fire or in the sun until it's hard. Then the meat is pounded into small pieces and mixed with melted fat. Usually, the ratio of meat to fat is 50:50.

Some extreme mountaineers prescribe a tablespoon or two of cooking oil just before bedtime, to keep bodies warm through the night (when sleeping in tents).

Modern day diets for scientists in Antarctica contain more chocolate, butter and other fatty ingredients.
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