http://www.nytimes.com/2007/08/07/scien ... ref=slogin
It’s easy to fear and despise our body fat and to see it as an unnatural, inert, pointless counterpoint to all things phat and fabulous. Yet fat tissue is not the problem here, and to castigate fat for getting too big and to blame it for high blood pressure or a wheezing heart is like a heavy drinker blaming the liver for turning cirrhotic. Just as the lush’s liver was merely doing its hepatic best to detoxify the large quantities of liquor in which it was doused, and just as the alcoholic would have been far worse off had the liver not been playing Hepa-filter in the first place, so our fat tissue, by efficiently absorbing the excess packets of energy we put in our mouths, has our best interests at heart.
“Obesity is not due to any defect in adipose tissue per se; it’s an issue of energy balance,†said Bruce M. Spiegelman of the Dana-Farber Cancer Institute in Boston. If you are consuming too many calories relative to what you burn off, the body must cope with that energy surplus, he said, “and adipose tissue is the proper place for it.â€
“If you had no fat cells, no adipose tissue, you’d still be out of energy balance, and you’d put the excess energy somewhere else,†he said, at which point really bad things can happen. Consider the lipodystrophy diseases, rare metabolic disorders in which the body lacks fat tissue and instead dumps its energy overruns in that jack-of-all-organs, the liver, causing extreme liver swelling, liver failure and sometimes liver-bearer death.
“Some adipose tissue is a good thing,†said Barbara Kahn, chief of the endocrinology, diabetes and metabolism division at Beth Israel Deaconess Medical Center, at Harvard.