Glucomannan is high in fiber, essential for cleaning the digestive system. Glucomannan is taken from the Konnyaku root and is from the same family as the yam, which is 100 percent natural dietary fiber without calories. Since lack of fiber is a major cause for the high incidence of growing gastrointestinal disorders, it is a valuable herb.
It helps reduce cholesterol, helps maintain regularity and promotes bowel health. It helps to normalize blood sugar, to relieve stress on the pancreas and to discourage blood sugar abnormalities, such as hypoglycemia.
Glucomannan absorbs toxic substances produced during digestion and elimination. It binds toxic material and eliminates them before they can be absorbed into the blood stream.
Glucomannan acts as a prevention of chronic disease and a weight control agent. As a diet aid, it expands to about 50 times its original volume when used with a large glass of water.
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What does it do?
Glucomannan is a water-soluble dietary fiber that is derived from konjac root (Amorphophallus konjac). Like other forms of dietary fiber, glucomannan is considered a “bulk-forming laxative.†Glucomannan promotes a larger, bulkier stool that passes through the colon more easily and requires less pressure—and subsequently less straining—to expel.
Good results have been noted in preliminary1 and double-blind studies2 3 4 5 of glucomannan for the treatment of constipation. In constipated individuals, glucomannan and other bulk-forming laxatives generally help produce a bowel movement within 12 to 24 hours.6 The use of glucomannan for diverticular disease of the colon has also been studied in preliminary research; about one-third to one-half of the subjects were found to benefit from glucomannan.7
Glucomannan delays stomach emptying, leading to a more gradual absorption of dietary sugar; this effect can reduce the elevation of blood sugar levels that is typical after a meal.8 Controlled studies have found that after-meal blood sugar levels are lower in people with diabetes given glucomannan in their food,9 and overall diabetic control is improved with glucomannan-enriched diets according to preliminary10 and controlled11 12 trials. One preliminary report suggested that glucomannan may also be helpful in pregnancy-related diabetes.13 One double-blind study reported that glucomannan (8-13 grams per day) stabilized blood sugar in people with the insulin resistance syndrome (syndrome X).14 In a preliminary study,15 addition of either 2.6 or 5.2 grams of glucomannan to a meal prevented hypoglycemia in adults with previous stomach surgery; a similar study of children produced inconsistent results.16
Like other soluble fibers, glucomannan can bind to bile acids in the gut and carry them out of the body in the feces, which requires the body to convert more cholesterol into bile acids.17 This can result in the lowering of blood cholesterol and other blood fats. Controlled18 19 and double-blind20 21 studies have shown that supplementation with several grams per day of glucomannan significantly reduced total blood cholesterol, LDL (“badâ€) cholesterol, and triglycerides, and in some cases raised HDL (“goodâ€) cholesterol. One double-blind study reported that glucomannan (8-13 grams per day) lowered total and LDL cholesterol in people with the insulin resistance syndrome.22
Glucomannan may help weight loss by occupying space in the stomach, thereby making a person feel full. One double-blind study reported weight loss averaging 5.5 pounds in adults when one gram of glucomannan was taken with a cup of water one hour before each meal for eight weeks.23 However, a similar study of overweight children found that glucomannan was not significantly more effective than a placebo.24 Other controlled studies have found that glucomannan improves the results of weight loss diets in overweight adults25 and children.26
Where is it found?
Glucomannan is a purified fiber from konjac root that is available as a bulk powder or in hard-gelatin capsules. Whether any foods contain significant amounts of glucomannan is unclear.
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