Dangers of the konjac root

Updated April 17, 2017

Konjac mannan root, also known as glucomannan, is a soluble fibre that is used to thicken Asian food, such as tofu and noodles. When the root comes in contact with water, it doesn’t dissolve but turns into a non-digestible gel that the body excretes, according to the website It is used in diet pills because it gives a feeling of fullness or satiety. It has also been found to treat constipation and may lower cholesterol levels as well. There are several possible side effects to eating konjac root, but they’re mostly minor and reversible.


Like many other soluble fibres, konjac root can cause increased bowel movements, diarrhoea, bloating, abdominal pain and flatulence, reports Ray Sahelian, M.D., on the website. Reducing the amount of root you eat will typically reverse these symptoms, according to the website.


Konjac root may prevent the body from fully absorbing nutrients in other foods, so it is advisable to take a daily multivitamin to avoid developing a nutritional deficiency, according to the website

Swallowing Difficulties

The diet pills containing the kinjac root should be taken with water, but this combination could cause the pill to expand in the throat, although this is a rare side effect.

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About the Author

Barbara Bryant has been writing professionally for 25 years. She has contributed to "The Military Engineer" and ASCE's "Civil Engineering" magazines as well as many other publications. Through newsletters and blogs, Bryant specializes in health and fitness topics, drawing on expertise from personal trainers and a naturopathic doctor.