It's true though, if you go up to a hundred people and ask them "what diseases does obesity cause", I guarantee you that the amount of people who mention NAFLD (non-alcoholic fatty liver disease) will be at most in the low single figures, and most likely because they or someone close has it so bad that it has been diagnosed. Vast numbers of fat people have it and have no idea that they are permanently damaging their liver. One of the most disturbing things I've seen is the liver biopsy results of rats born to heavily obese mothers in a scientific study, which already have an early form of NAFLD even before they are born. The scale of this problem which barely gets mentioned is actually quite worrying.