The definition of healthy obesity in this study was low levels of liver fat (indicative of little insulin resistance in the liver). This is best measured by the TG/HDL. If the TG/HDL ratio is low, the excess calories will be stored in healthy fat cells that can easily expand. If the TG/HDL ratio is high, the development of new health fat cells will be compromised and the excess calories will be deposited in other organs leading the lipotoxicity. I explained this in much greater detail in my 2008 book, Toxic Fat.
Dr. Sears Comments: