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Fructose, Lactose & Histamine

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On this free to use website, you can find useful information about lactose intolerance, fructose malabsorption, histamine intolerance, gluten intolerance or coeliac disease, and much more. The information provided is subject to stringent quality criteria.

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Fructose: the fruit sugar

The structure displayed here is α-D-Fructofuranose, a ring form of fructose. Fructose is optically active (stereoisomer) and belongs to the category of monosaccharides (simple sugars); more precisely, it is a hexose (6 C atom). Fructose is also a ketose because of its ketone group. Fructose has the chemical formula C6H12O6. In its crystalline form it is present as fructopyranose, bound as fructofuranose.

In nature, fructose is present especially in plants (fruits). It is absorbed via the GLUT-5 transporter and metabolised in the liver (glycolysis). Due to its slower absorption into the bloodstream it is also used in dietetic food products intended for those with diabetes mellitus type II as a substitute for the faster acting sugars such as cane sugar and beet sugar (sucrose) that are mostly used.

fruktose_struktur

Sources:
Stryer, L., Biochemie, Specktrum Akademischer Verlag, 4. Auflage
Beliz, H.D., Lehrbuch der Lebensmittelchemie, Springer Verlag, 2001.

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The food intolerance network is a charity that provides worldwide information about lactose intolerance, fructose malabsorption, histamine intolerance, FODMAP-diet and much more. Usage of this website is free of charge. We are funded by the "Society for Public Health" and advertisements that have no influence on the editorial content of our website. Please read our terms of use before you use our services.

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The information provided on the Food Intolerance Network website is no substitute for a visit to a registered dietician, nutritionist or a doctor. The information that you will find here may not be used as a substitute for professional advice and treatment by a medical professional or approved and registered dieticians. The content of the Food Intolerance Network website may not be used as a basis or means for any form of self-diagnosis.

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