"The first study showed that male rats given water sweetened with high-fructose corn syrup in addition to a standard diet of rat chow gained much more weight than male rats that received water sweetened with table sugar, or sucrose, in conjunction with the standard diet. The concentration of sugar in the sucrose solution was the same as is found in some commercial soft drinks, while the high-fructose corn syrup solution was half as concentrated as most sodas."
That study doesn't say anything as to whether high-fructose corn syrup is unhealthier than regular syrup. That study's only claim is that mice gain more weight if they eat high-fructose corn syrup compared to normal syrup. I think they could have probably counted the calories within each sample and saved everyone a lot of time.
And who's to say additional weight gain is bad for those mice? Mammals in a cold climate might appreciate the additional weight gain.
From the article: "[The study] demonstrated that rats with access to high-fructose corn syrup ... gain significantly more weight than those with access to water sweetened with table sugar, even when they consume the same number of calories."
So, they did indeed count the calories and the result seems to indicate something about HFCS encourages rats to gain weight in a way that standard table sugar does not.
Your quote is from the caption, the actual article gives no indication of caloric intake.
More importantly, you are just repeating the line that high fructose corn syrup causes more weight gain. So what? There is no indication that this is a bad thing.
http://www.princeton.edu/main/news/archive/S26/91/22K07/inde...
Not saying one two-part study alone is everything, but it's also not nothing.