Brown fat may warm us up at dawn

Brown fat is well known for protecting the body from cold temperatures, and now researchers have discovered that this cell type in humans shows circadian rhythms in its consumption of glucose — an energy fuel for heat production. These rhythms, which rise just before waking, may have evolved as a thermal defense mechanism to prepare our ancestors for hunting and gathering in the coldest morning hours.

from Fitness News — ScienceDaily http://bit.ly/1UW5SYa
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