What does fructose mean?
Fructose is a simple sugar — technically a monosaccharide with the formula C6H12O6 — found naturally in fruits, honey, and certain root vegetables. It is the sweetest of the naturally occurring sugars, tasting roughly twice as sweet as table sugar (sucrose) by weight, and it shares its chemical formula with glucose while differing sharply in structure and in how the body processes it: fructose is metabolised chiefly in the liver rather than being taken up directly by cells throughout the body. The word derives from the Latin 'fructus', meaning fruit, since the sugar was first isolated from fruit sources. In everyday life fructose matters most through high-fructose corn syrup, a cheap sweetener ubiquitous in soft drinks and processed foods, whose health effects have been widely debated. Medical contexts also invoke fructose in conditions such as fructose intolerance and fructose malabsorption, making the term essential reading in both nutrition science and everyday health discussion.
nounA simple sugar (monosaccharide) found naturally in fruits, honey, and some vegetables; it is the sweetest of the naturally occurring sugars and is often used as a sweetener in processed foods, typically as high-fructose corn syrup.
- As a chemical substance: a monosaccharide sugar, C6H12O6, occurring naturally in fruit, honey, and some vegetables, notable for being sweeter than sucrose or glucose.
- As a commercial product: refined fructose or high-fructose corn syrup used as a sweetener in soft drinks, confectionery, and processed foods.
"The sweetness of a ripe peach comes largely from its fructose."
"People with hereditary fructose intolerance must strictly avoid fruits, honey, and products containing the sugar."
"Nutritionists have raised concerns about the high levels of fructose in sweetened beverages."
Fructose is so sweet that just half as much of it makes food taste as sweet as ordinary table sugar — which is exactly why it became the food industry's favourite ingredient.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of fructose
Fructose entered English in the mid-nineteenth century, coined by combining the Latin 'fructus' (fruit) with the '-ose' suffix used for sugars, after the German chemist Augustin-Pierre Dubrunfaut first isolated the substance around 1847 from fruit sources. The name literally means 'fruit sugar', and it belongs to the same family of carbohydrate names built on '-ose' as glucose and sucrose. An older alternative name, levulose, reflects the compound's property of rotating plane-polarized light to the left ('laevo'), mirroring dextrose for the right-rotating glucose. Its root in Latin 'fructus' also connects it to words such as fructify and fruitful.
How fructose is actually used
Fructose is a technical term from chemistry and nutrition science but appears widely in everyday health writing and food labelling. In scientific contexts it may be called 'levulose' (an older name reflecting that solutions of it rotate polarized light to the left); 'fruit sugar' is the lay term. It has no plural form — it denotes a single substance, so references to 'fructose' are always to the substance generally, not to individual units, though chemists may speak of fructose molecules.
Easily confused with fructose
Glucose is the body's primary energy sugar that cells metabolize directly, whereas fructose is a sweeter simple sugar metabolized mainly in the liver and found especially in fruit and honey.
Sucrose is common table sugar, a disaccharide composed of one glucose unit joined to one fructose unit, whereas fructose is the single-sugar component itself.