"High fructose" refers to a type of sugar that is made from corn syrup. It is called "high" because it contains a larger amount of fructose compared to regular table sugar. Full definition
However, the use of high fructose corn syrup has started declining slightly, in line with the rising popularity of artificial sweeteners. (healthline.com)
If your kid is only eating packaged foods with high fructose corn syrup, that basically means they're only eating cookies and crackers, not a good thing. (kidsinthehouse.com)
I've never been able to find canned sauce that doesn't contain high fructose corn syrup. (thefrugalgirls.com)