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fructose

Pronunciation: [FRUHK-tohs; FROOK-tohs]

Also called fruit sugar and levulose, this extremely sweet substance is a natural by-product of fruits and honey. It's more water-soluble than sucrose (with fewer calories). Unlike glucose, it can be used by diabetics. Fructose comes in granulated and syrup forms. Except in the case of some liquids, such as a sauce or beverage, it should not be substituted for regular sugar (sucrose) unless a recipe gives specific substitution. When heated, fructose loses some of its sweetening power.