The 4-Hour Body - An Uncommon Guide to Rapid Fat-Loss, Incredible Sex, and Becoming Superhuman - Timothy Ferriss
If the science gets too dense and you want the index card version, skip to "Ice Age Revisited--
Four Places to Start" on this page. I won't be offended.
Fat-Burning Fat
Not all fat is equal. There are at least two distinct types: white adipose tissue
(WAT) and brown adipose tissue (BAT).
WAT is what we usually think of as fat, like the marbling on a steak. A WAT cell--an adipocyte
--is composed of a single large fat droplet with a single nucleus.
BAT, in contrast, is sometimes referred to as "fat-burning fat" and appears to be derived from
the same stem cells as muscle tissue. A BAT cell is composed of multiple droplets that are
brown in color because of a much higher volume of iron-containing mitochondria. Normally
associated with muscle tissue, mitochondria are best known for producing ATP and oxidizing fat
in muscle tissue. BAT helps dissipate excess calories as heat
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