Hidden Sugars, as in Fructose, Sucrose, Dextrose More and more packaged foods are sweetened with a baffling array of sugars, which add calories without boosting nutritional value. Ingredients that end in the word "ose" are all forms of sugar, as are honey and corn sweeteners. A recent study at the University of California, Davis showed that these sweeteners had a similar metabolic effect to other forms of sugar. Still, all sweeteners add calories but few nutrients, and they can contribute to weight problems. To know exactly how many grams of total sugar a product contains, check out the nutrient facts label. Four to 5 grams of sugar is the equivalent of a level teaspoon.