Vogue -
14 Jan 2017 16:00

Brown fat! I knew nothing about brown fat until I biked my 4-year-old to school one frigid winter morning. It was only a mile or so, but it couldn't have been more than 20 degrees. Vivian screamed through her scarf the whole way, poor thing. "Daddy, I'm cold! I'm too cold." I got some disapproving looks when I lifted her, shivering and red-faced, off the child seat. Thankfully, one mom, Massachusetts-bred, told me, don't worry, "The cold is good for her." Cold can help develop brown fat, the goo...
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