>Human babies can make fat out of carbohydrate and water, so if they
>consume more calories than they need for growth and energy use, they
>could put on any needed insulation.

Adult people in cold climates do not have more fat on their bodies than
people in hot climates.  They do not need fat for insulation, because they
have culture, in the form of clothing, housing, fire/heaters, and physical
activity.  In traditional times, inside an igloo, the ice-block winter
houses of Arctic native populations, it was often 70-80 degrees, and people
took their clothes off in the hallway leading to the main room.  The fur
clothing also had lots of different "vents" build in that could be opened to
dissipate excess heat during physical activity.

Kathy Dettwyler

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