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What is Glucomannan? Glucomannan is a natural, water-soluble dietary fiber extracted from the roots of the elephant yam. 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 is used as a food additive, specifically as 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 if you empty a Glucomannan capsule into a small glass of warm water, the entire thing turns into a gel. These unique properties are believed to mediate its effects on weight loss.

Dr Mark Hyman on Glucomannan the Super Fiber

Glucomannan is a water-soluble dietary fiber, extracted from the roots of the elephant yam. It has recently gained considerable attention as an effective weight-loss supplement.

How to Lose Weight Fast and Easy!

weight loss solutionHow Does Glucomannan Help with Weight Loss? Glucomannan is a water-soluble dietary fiber. Like other soluble fibers, it is believed to promote weight loss via several mechanisms (1):  


  • It has a very low calorie content.
  • It takes up space in the stomach and promotes a feeling of fullness (satiety), reducing food intake at a subsequent meal.
  • It delays emptying of the stomach, contributing to increased satiety (2).
  • Like other soluble fibers, it reduces the absorption of protein and fat (3).


It also feeds the friendly bacteria in the intestine, which turn it into short-chain fatty acids like butyrate, shown to protect against fat gain in some animal studies (4, 5). Feeding the friendly gut bacteria may also have other benefits, and some studies have shown a correlation between altered gut bacteria and body weight (6, 7). Glucomannan is different from other soluble fibers due to it being even more viscous, which makes it particularly effective.

Glucomannan absorbs water in the stomach and contributes highly to satiety – the state of feeling full. It also promotes reduced calorie intake and weight loss via several other mechanisms.

Does it Really Work?

Studying mechanisms is always interesting… but what we really want to know is if this stuff leads to actual kilos being lost. Fortunately, we have several randomized controlled trials on Glucomannan. These types of studies are the “gold standard” of scientific experimentation in humans.


In the biggest one, 176 healthy overweight people were randomly assigned to ingest either a supplement with Glucomannan, or placebo (a dummy pill), while on a calorie-restricted diet (8). Three different Glucomannan supplements were tested, with varying dosages. Some also had other fibers added to them. These were the results after just 5 weeks: weight loss graph As you can see, weight loss was significantly greater in the Glucomannan groups. There are several other studies that agree with this. Glucomannan causes modest weight loss in overweight and obese individuals when regularly ingested before a meal (9, 10, 11). It is especially effective when combined with a weight-reducing diet. The same applies to all weight-loss methods… they work best in combination.

Other Health Benefits

In addition to promoting weight loss, Glucomannan may improve a number of risk factors for heart disease. According to a systematic review of 14 studies, Glucomannan can (10):


  • Lower total cholesterol by 19 mg/dL (0.5 mmol/L).
  • Lower LDL cholesterol by 16 mg/dL (0.4 mmol/L).
  • Lower triglycerides by 11 mg/dL (0.12 mmol/L).
  • Fasting blood sugar by 7.4 mg/dL (0.4 mmol/L).


The main mechanism by which it reduces blood cholesterol is by decreasing absorption of cholesterol in the gut. According to these studies, adding Glucomannan to your diet could potentially lower the risk of developing heart disease and type 2 diabetes. Being a water-soluble fiber, Glucomannan has also been successfully used to treat constipation (12, 13).

Glucomannan can cause improvements in several important risk factors for heart disease, including total cholesterol, LDL cholesterol, triglycerides and fasting blood sugar.

Dosage and Side Effects

For weight loss, a dosage of 500 mg (1 capsule), 3 times per day is considered sufficient.

weight loss pill dosage

In contact with water, Glucomannan expands and can absorb up to 50 times its weight. Therefore, the recommended dosage of Glucomannan is lower compared to other fiber supplements. Glucomannan is taken before a meal. Timing recommendations range from 15 minutes to 1 hour before a meal (14, 8).


Glucomannan is considered to be totally safe with no known side effects after years of study and use. It contains no stimulants that can harm the heart or increase blood pressure. It is completely safe to use with any medication including medications for diabetes and high blood pressure, Wafrin etc etc.
You will lose weight fast, naturally and safely!

Ingredient and manufacturing safety

Glucomannan has been tested exhaustively over many decades and has been found to be 100% natural, safe and effective. It has no side effects and contains no stimulants that can harm the heart or increase blood pressure. It is completely safe to use with any medication including medications for diabetes and high blood pressure.


natural product association

However, Glucomannan can reduce the absorption of oral medications like sulfonylurea, a diabetes drug. This can be avoided by taking the diabetes medications at least 4 hours after or one hour before ingesting Glucomannan. LetsBeSlim’s contains 100% Glucomannan. No Fillers, No Binders, Just 100% pure Glucomannan! LetsBeSlim’s Glucomannan is supplied by an ISO 9001:2008 registered firm based in Cape Town.




You will lose weight, naturally and safely! If you want to try Glucomannan, then click here

Should You Try Glucomannan?

According to the evidence, Glucomannan is an effective weight-loss supplement. But same as with pretty much any weight-loss strategy, it doesn’t work in isolation. The only known way to lose weight in the long-term, is to make a permanent change to your lifestyle. And that is our strength! We make it extremely easy for you and all for FREE!!


With the two bottles of LetsBeSlim (yes 2!! Since it’s on Special at the moment), you also get for FREE: Easy Recipes, Menus and even Weekly Shopping Lists for a Month. Simply Delicious food! Fast & Easy to make, using everyday food, and the whole family will love it! Click here for a sample.

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