Welcome to the food intolerance network

The leading website for food intolerances and food allergies.

Fructose, Lactose & Histamine


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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Diagnosis & treatment

A reliable diagnosis can only be obtained through a biopsy of the small intestine. This can determine the sucrase-isomaltase activity in the tissue of the small intestine. It is also possible to perform a hydrogen breath test.


Dominosteine_pixelquelleThe diet consists of eating foods that are low in sucrose. Sucrose, also known as granulated or household sugar, a disaccharide, is largely replaced by glucose (dextrose), fructose (fruit sugar) and lactose (milk sugar).

Look out for some fruits because they quite often contain high levels of sucrose.

Whether the affected person will have to observe a very strict diet or only a relatively strict diet depends on the residual activity of the enzyme.

There are enzyme supplements available on the market for this dissacharidase deficiency. They can be used to alleviate a strict diet regime.

If you do have sucrose intolerance diagnosed by your doctor, please consult experts in nutrition to create a good and healthy diet for yourself!

1) Treem, William R.; Congenital Sucrase-Isomaltase Deficiency. Journal of Pediatric Gastroenterology & Nutrition: July 1995 - Volume 21 - Issue 1 - ppg 1-14

What we do and who we are

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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On this website you can open a free account and interact with many others suffering from food intolerances. You can organize groups and events, can upload fotos, discuss, ask and answer others, you can add friends and much more. We are the leading community for people with food intolerances, food allergies or irritable bowel syndrome (IBS).

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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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