Fructose is a monosaccharide, a simple sugar. It is commonly added to foods in the form of high-fructose corn syrup (HFCS). Fructose corn syrup has been associated with increased insulin resistance and the development of Metabolic Syndrome. Try to reduce your intake of products that list fructose corn syrup as one of their main ingredients, such as sodas, candy, frozen desserts, sweetened canned fruit, and fruit juices.