An excerpt from Dr. Robert Lustig’s “Fat Chance” | MSNBC

Here's the kicker. Being thin is not a safeguard against metabolic
disease or early death. a full 40% of normal-weight individuals harbor
insulin resistance—a sign of chronic metabolic disease—which will
likely shorten their life expectancy. of those, 20% demonstrate liver
fat on MRI of the abdomen (see Chapter 8).7 Liver fat, irrespective of
the rest of body fat, has been shown to be a major risk factor for the
development of diabetes. You think you're safe? You are SO screwed.
And you don't even know it.

http://tv.msnbc.com/2013/01/08/an-excerpt-from-dr-robert-lustigs-fat-chance/