Fructose intolerance: Which foods to avoid? - Mayo Clinic Jan 21, 2022 · Fructose is a sugar found naturally in fruits, fruit juices, some vegetables and honey. Fructose is also a basic component in table sugar (sucrose), and high-fructose corn syrup is used to sweeten many processed foods and beverages. When your digestive system doesn't absorb fructose properly, it can cause abdominal pain, diarrhea and gas.