Fructose is a simple sugar (monosaccharide) found in many foods. It is also one of the three most important blood sugars, the other two are glucose and galactose. Honey; tree fruits; berries; melons; and some root vegetables, such as beets, sweet potatoes, parsnips and onions, contain fructose, usually with sucrose and glucose. Processed foods also contain fructose due to how sweet it is. view more...