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NOW Fructose is almost 50% sweeter than sucrose and requires about 2/3 the amount to get the same sweetness. This means fructose provides nearly 33% fewer calories per serving. Fructose is commonly called "fruit sugar" because it is the main sugar in many fruits. However, fructose is now produced from corn syrup, which is derived from corn.
In general, if a recipe calls for 1 cup of sugar, you should be able to substitute a little over a 1/2 of a cup of fructose. Sweeten to taste is the best advice.