Displaying 6 results of Fructose Impurities Fructose is a natural sugar found in fruits, vegetables, and honey. However, the production of high fructose corn syrup has led to the presence of fructose impurities. These impurities, such as glucose, sucrose, and other sugars, can affect the taste, texture, and quality of foods and beverages that contain fructose. Additionally, consuming high levels of fructose impurities has been linked to health problems such as obesity, diabetes, and heart disease.