Glucomannan is a natural, water-soluble dietary fiber extracted from the roots of the elephant yam, also known as konjac.
It’s available as a supplement, in drink mixes and is also added to food products, such as pasta and flour. It’s also the main ingredient in shirataki noodles.
Glucomannan comprises 40% of the dry weight of the elephant yam, which is originally from Southeast Asia. 
It has a long history of use in herbal mixtures and traditional foods like tofu, noodles and konjac jelly.
In addition to being sold as a dietary supplement, it’s used as a food additive — an emulsifier and thickener denoted with the E-number E425-ii.
Glucomannan has an exceptional ability to absorb water and is one of the most viscous dietary fibers known.
It absorbs so much liquid that a small amount of glucomannan added to a glass of water turns the entire content into a gel.
These unique properties are believed to mediate its effects on weight loss.

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