The other part is satiation, and insulin response. Higher levels of fructose do not trigger a normal insulin response, and while food sweetened with sugar vs HFCS will have a similar caloric value --- you wont "feel" satiated due to the unbalance and irregular insulin response. Thus you are more inclined to continue to consume more.
Coca-cola for example, anywhere else in the world, except the U.S. is made with sugar. You will (should) feel satiated after consuming a bottle of a sugary beverage. Whereas with HFCS you will be more inclined to have another.
This information has been known for more than a decade. This article Consumption of sugars and the regulation of short-term satiety and food intake
, is from 2003.
I imagine the Corn Industry lobby has done their best to suppress this information. The corn industry is heavily subsidized in the US, along with Sugar having import tariffs.
Hell, a few years back know their was a campaign to rename HFCS to Corn Sugar --- as HFCS has gotten too much bad press. I think it didn't get past the FDA