Glucomannan is a water-soluble polysaccharide with hygroscopic properties and is considered a dietary fiber. The dry powder swells into bulky fiber in water absorbing up to 50 times its weight while in water. Glucomannan s principal use is as a bulking agent to promote the feeling of fullness or satiety thereby helping to manage food intake. Glucomannan might work in the stomach and intestines by absorbing water to form a bulky fiber which treats constipation.