2) Sugary beverages are a key factor in rising obesity rates. They happen to be sweetened, usually, with high-fructose corn syrup. But, again, that's because it's the cheapest sweetener. It's probably not the specific sweetener that's the problem here, but the fact that Americans drink a lot of sugary beverages. We'd be seeing a problem from over-consumption even if the sweetener was sugar.
It's like I posted earlier: cane sugar affects the body differently than corn sugar. It takes less of a drink sweetened with cane sugar to satisfy than it does a drink sweetened with high fructose corn syrup. The end result: with the prevalence of HFCS in soft drinks, more are consumed, and we're all fatter for it.