Glucomannan

Glucomannan is a water-soluble polysaccharide that is considered a dietary fiber. It is a hemicellulose component in the cell walls of some plant species. Glucomannan is a food additive used as an emulsifier and thickener. Products containing glucomannan, marketed under a variety of brand names, are also sold as nutritional supplements for constipation, obesity, high cholesterol, acne vulgaris and type 2 diabetes. Although there is some clinical support for potential health benefits, the U.S. Food and Drug Administration (FDA) has not approved any product containing glucomannan for the treatment of these medical conditions. Health Canada has authorized some products containing glucomannan for the purposes of appetite reduction, weight management, treatment of constipation and management of high cholesterol levels.

Glucomannan is also the main ingredient in shirataki noodles and konnyaku which are traditional Japanese foods. These products are made from the ground corm of the konjac plant. These natural products have been eaten in Japan for centuries. Because of the fiber content and health benefits, they are known as the "broom of the intestine" in Japan. They are now being marketed for weight loss, relief from constipation and other health benefits in the United States and worldwide due to the low calorie count.