Known Konjac and Glucomannan Side Effects, Risks and Warnings

Start with a Little

When consuming fibre dietary supplements, it is best to start out with a smaller than the recommended amount and increase gradually. It is also recommended to drink plenty of water each time a bulk-forming soluble fibre is consumed. This allows the fibre to absorb the consumed water rather than drawing further moisture from your body.

Gut Microbiota and Flatulence

Gut microbiota naturally ferment soluble fibres in the large intestine. While recent science suggests there are some great side effects to be explored here, for some individuals not accustomed to a high fibre diet, a sudden intake of high maounts of soluble fibre may initially produce intestinal wind. This may lead abdominal discomfort.

Increasing soluble fibre intake speeds up the time for faecal pass through and will lower the time fermenting materials spend in the large intestine so any discomfort may be initial and temporary as the microbiome adjusts to the new source of food.

If in doubt, we suggest you consult with a nutritionist or doctor for advice on increasing soluble fibre intake in your diet.

Choking Hazard

Taking Konjac or Glucomannan in capsule form could become lodged in the throat and swell causing obstruction to the airway. While the reports are rare (there is one report of such an occurrence based in Canada that many of these claims are based on) care should be taken when using soluble fibre in capsule form. Be sure to drink plenty of water with the capsule.

Misrepresentation by Marketers

Konjac is somewhat new to the western market and is often misrepresented. Here's a few pointers to help spot an misrepresented product.

The Glucomannan (the fibre) content should be clearly stated in percentage between 40% and 95% Glucomannan, this higher the percentage the less is needed for the desired effect, the lower the percentage the more plant based marine smell will be present in the powder.

A konjac seller should clearly disclose the expiry date. Konjac has a limited shelf life and products that do not state an expiry date are less likely to be of good quality and show a misunderstanding of the product by the marketer.

Country of origin. The Konjac plant is native to parts of South East Asia. This is where Konjac is grown and processed. Products stating an origin from other part of the globe are most likley misrepresented and should be avoided.

General Warnings

Pregnant or lactating women, diabetics, hypoglycaemics, and people with known medical conditions and/or taking drugs should consult with your nutritionist or licensed physician prior to taking dietary supplements.