It could be a situation of false, or misleading labeling.
I can't eat cereals like that any longer. I also can't eat donuts or most mass produced grocery store level bakery products either, because the "sugar" has been replaced with HFCS.
They can call it any number of trade names they like, but sugar from corn isn't the same thing as sugar from sugar cane. Real sugar I can handle 24/7 with no issues. HFCS just flat out whacks the crud out of me. I really miss drinking root beer too.