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Can you lose weight eating konjac?

Weight management Glucomannan made from konjac may be beneficial for people who are looking to lose weight. A 2005 study found that the soluble dietary fiber supplement helped people with overweight reduce their body weight.

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We do the research so you can find trusted products for your health and wellness. Our team thoroughly researches and evaluates the recommendations we make on our site. To establish that the product manufacturers addressed safety and efficacy standards, we: Medical News Today only shows you brands and products that we stand behind.

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We include products we think are useful for our readers. If you buy through links on this page, we may earn a small commission. Here’s our process. In this article, we explain the potential health benefits according to research. We also look at how to use konjac and some risks to consider before taking it as a supplement. The Latin name for the konjac plant is Amorphophallus. People also refer to it as konjaku, elephant yam, devil’s tongue, snake palm, and voodoo lily. Konjac is a plant that manufacturers use to make high fiber dietary supplements, jellies, and flour. It plays a role in traditional Japanese and Chinese medicine.

Several different products use konjac corm, including:

The konjac plant has a starchy root called a corm. This is high in a type of dietary fiber called glucomannan. Manufacturers use this part of the plant as a dietary supplement and in the production of high fiber flour and jellies. Konjac has several potential health benefits. Many of these benefits relate to its high content of glucomannan, the soluble dietary fiber that naturally occurs in the konjac plant.

The sections below discuss these potential health benefits in more detail.

1. Diabetes management

Research suggests that consuming a mix of glucomannan and American ginseng can lead to a moderate improvement in the management of type 2 diabetes. One 2015 review also found that glucomannan made people with diabetes less likely to eat foods that could increase their blood sugar levels. This is because it made them feel fuller for longer.

Learn more about the health benefits of ginseng here.

2. Weight management

Glucomannan made from konjac may be beneficial for people who are looking to lose weight. A 2005 study found that the soluble dietary fiber supplement helped people with overweight reduce their body weight. The participants took the supplement as part of a balanced, calorie-controlled diet. However, one 2014 meta-analysis found that there was no benefit of using glucomannan versus a placebo for weight loss. Also, side effects of the fiber supplement included abdominal discomfort, diarrhea, and constipation. Glucomannan may help a person feel full for longer by slowing the rate at which the digestive system empties.

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Researchers compared the effects of the glucomannan supplement with those of a guar gum supplement. They found that the glucomannan supplement slightly increased weight loss, whereas the guar gum supplement did not. However, other research found that konjac did not promote weight loss or significantly alter body composition, change feelings of hunger or fullness, or improve lipids or blood glucose parameters, even though the participants seemed to tolerate the supplement well.

3. Cholesterol

Having high cholesterol increases a person’s risk of heart disease and stroke. Doctors recommend water-soluble fiber to support healthy cholesterol levels and weight management. A 2019 study in rats with diabetes found that administering konjac glucomannan significantly reduced total cholesterol levels, as well as low-density lipoprotein. This is known as “bad” cholesterol. A study from 2017 investigated what dosage of glucomannan would be needed to improve cholesterol levels. Researchers found 3 grams per day to be beneficial.

4. Constipation

Taking a glucomannan supplement may help regulate bowel movements and prevent constipation.

A review from 2017 found that taking glucomannan improved the frequency of bowel movements in children with constipation. However, the researchers also found that taking glucomannan did not always improve stool consistency or the overall success rate of treatment. A study from 2018 also suggested that glucomannan supplementation can improve constipation symptoms during pregnancy. Glucomannan reportedly increased the frequency of stools and improved their consistency.

5. Healthy skin

The glucomannan content may also help people looking to improve the health of their skin. For example, a 2013 study found that glucomannan may provide benefits as a topical therapy for acne, as well as improve overall skin health.

6. Wound healing

As well as supporting skin health, glucomannan may also help the body heal wounds more quickly. One 2015 study in mice found that glucomannan supplements might encourage wound healing by supporting the immune system. However, more research is necessary to conclude that glucomannan has the same effect in humans.

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