Fructose is a monosaccharide like glucose. Fructose is a type of sugar that makes up 50% of table sugar (sucrose = fructose + glucose). Fructose is metabolized primarily in the liver. It’s naturally found in fruit, honey, agave and most root vegetables. Moreover, it’s commonly added to processed foods in the form of high-fructose corn syrup. Fructose is sourced from sugar cane, sugar beets, and corn. High-fructose corn syrup is made from cornstarch and contains more fructose than glucose, compared to regular corn syrup. Fructose from whole fruits is generally not considered a problem, but the processed forms are increasingly connected to metabolic disease.