Spurlock was definitely stating the obvious, but it was scary just how quickly his health deteriorated when he ate only McD's products.
It wasn't just the amount of food, it was the numbers. The doctors were shaking their heads--they were looking at a liver of an alcoholic. They never thought anyone could do this to their livers on fast food.
And the comparison to drug addiction seems apt. A lot of obese people overeat because they can't seem to stop. Being raised to recognize Ronald McDonald from childhood doesn't help.