I work with an organic jam producer and I reached to our resident scientist requesting his take on myth #2. Here is his response:
Chemically speaking, the claim that HFSC is identical to Sucrose is dead wrong. HFCS is a MIXTURE of separate molecules of fructose and glucose (monosacharrides). Sucrose is a so-called disaccharide - meaning that 1 molecule of sucrose is built from one glucose and one fructose molecule FUSED TOGETHER into 1 sucrose molecule. HFCS is available in varying mixtures of fructose and glucose ranging from about 45% fructose to up to 90% fructose. The blends are produced according to the sweetness level desired by the manufacturer - more fructose = sweeter taste per gram.
HFCS is made from corn starch, it is not made from corn juice in the way in which cane sugar is made. As such, it is not a naturally occurring sugar from corn - it is highly manufactured using various enzymatic processes.
I do not agree with the term "Corn Sugar" as it would not convey the true identity of the sugar. The term "Cane Sugar" makes sense for...well...CANE sugar. The term "Corn Sugar" does not make sense for HFCS.
HFCS has a bad reputation since it is used as a sweetener in soft drinks and many other sweet, conventional products. In addition, it is mainly made from GMO corn. As far as being "unhealthy" is concerned, I do not believe that any commonly consumed sugars are unhealthy in their own right - it is how much of them you consume relative to your diet, health and lifestyle that may be unheathly.