Konjac flour side effects

Updated February 21, 2017

Konjac flour is used in powder form as a weight-loss supplement. The flour comes from the Konjac plant, which is native to Asia and especially common in Japan and Indonesia. The powder is largely comprised of the carbohydrate Glucomannan, according to the site The side effects that arise from consuming Konjac flour are caused by the Glucomannan.

Bloating and Gas

Glucomannan is a fibre that is soluble in water, which means it readily dissolves once it reaches the stomach and intestines. Bacteria in the intestines cause the fibre to ferment, leading to bloating and gas. These symptoms are often accompanied by stomach aches and pains, a swollen abdominal area and the need to pass the gas. This side effect also results in a feeling of fullness, which may be one reason it works as a weight-loss supplement as the person who consumes it may not experience any hunger.

Bathroom Breaks

Glucomannan is a diuretic, which means it flushes the body of toxins through frequent urination. Those who consume the substance may want to stay close to a bathroom, both for Glucomannan's diuretic properties and its penchant for causing diarrhoea. The diarrhoea will usually be mild, according to the site, but still a factor when consuming Glucomannan.


Konjac flour is often consumed in the form of a tablet. The Glucomannan in the flour is very effective at absorbing liquid and expanding. Those with throat problems or issues with the oesophagus are at risk of having the tablet expand in their throats, causing it to get stuck and leading to choking.

Allergic Reactions

Those who are allergic to Glucomannan may have a host of other side effects from consuming the flour. These may include rashes or other skin conditions, chest congestion or pain, and congestion in the throat.

Other Warnings

The Glucomannan in Konjac flour, which can cause disruptions in the digestive system, may cause even greater damage if taken as a long-term weight loss solution, according to The site also notes Konjac flour is banned in Australia and has not been approved by the U.S. Food and Drug Administration.

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