HFCS is linked to an increased risk of obesity. More than a third of the U.S. population is overweight or obese.
Why is it there? After fat got a bad rap in the 1980s, manufacturers took out the oils and brought in high-fructose corn syrup -- a cheaper form of sugar -- to add flavor. It worked: Consumption of HFCS has increased more than 1,000 percent since 1970.