Konjac root, also known as elephant yam or konjac potato, is a type of tuber that has long been used in traditional Chinese and Japanese medicine. More recently, konjac root extract has gained popularity in Western countries as a potential remedy for promoting weight loss, improving digestion, and lowering cholesterol. But what exactly is konjac root extract, and is it truly good for health? This article will take an in-depth look at the science behind konjac root extract in order to understand its potential benefits, side effects, and expert recommendations for use.
What is Konjac Root Extract?
Konjac root extract is a dietary supplement derived from the konjac plant, which is native to eastern Asia. The starchy corm of the konjac tuber has been consumed as a food and herbal medicine in China, Japan, and Korea for centuries (1). Konjac flour and noodles made from the root are traditional foods in many Asian cuisines.
In recent decades, konjac root extract supplements containing the active compound glucomannan have become popular in the West. Glucomannan is a water-soluble polysaccharide that is considered the primary active constituent of konjac root. Supplements are made by grinding the konjac tuber into a powder and concentrating the glucomannan into an extract (2).
Konjac root extract is typically marketed in capsule or tablet form as a supplement for weight management, cholesterol control, and digestive health. It is also added to some food products like noodles, jellies, and shakes (3).
Active Ingredient in Konjac Root Extract
Glucomannan is the main bioactive compound found in konjac root that gives it its potential therapeutic properties (4). It comprises roughly 40% of the konjac tuber.
Glucomannan is a highly viscous dietary fiber that has the ability to absorb up to 50 times its weight in water (5). As it absorbs liquid, glucomannan forms a bulky gel that slows digestion and promotes feelings of fullness. This swelling effect is believed to be the mechanism behind konjac’s purported health benefits.
In addition to glucomannan, konjac root contains smaller amounts of beneficial nutrients like amino acids, vitamins, minerals, and antioxidant compounds that may also play a role in its effects (6). But experts agree that glucomannan is likely responsible for most of konjac’s therapeutic actions.
Is Konjac Good or Bad For You?
Several studies suggest konjac root extract may offer certain benefits when used appropriately:
Weight Loss
Multiple clinical trials show konjac root supplements can assist with weight loss and fat reduction. A systematic review of 11 studies found participants taking glucomannan supplements lost significantly more weight compared to placebo (7).
Heart Health
Human studies indicate konjac glucomannan can lower LDL (“bad”) cholesterol and triglyceride levels while raising HDL (“good”) cholesterol (8). This may reduce risk of heart disease.
Digestive Health
The bulking action of glucomannan can help treat constipation by reducing intestinal transit time and softening stool (9). It may also minimize symptoms of diarrhea by absorbing excess fluid (10).
Blood Sugar Control
Early evidence suggests konjac glucomannan may help control blood sugar spikes after eating by slowing digestion of carbohydrates (11). More research is needed in this area.
While these results are promising, large-scale, long-term studies on konjac root extract are still limited. Talk to your doctor before using it for any health condition.
How Does Konjac Root Help with Weight Loss?
Several mechanisms make konjac root extract helpful for losing weight:
- The highly viscous glucomannan absorbs water in the gut, forming a gelled fiber that promotes satiety and delays gastric emptying (12). This can curb appetite and calorie intake.
- The bulking effect of the glucomannan gel also slows digestion and triggers stretch receptors in the stomach, signaling the brain that you are full (13).
- Glucomannan may reduce the absorption of fat and protein in the small intestine, thus decreasing calorie uptake from food (14).
- Taking konjac root capsules with water before meals swells in the stomach occupying space and suppressing appetite (15).
Together, these mechanisms of glucomannan can support weight loss through reduced calorie consumption, increased satiation, and minimized fat absorption.
Are Konjac Noodles Good for Gut Health?
Konjac noodles are a popular food product made by adding konjac flour to water and cassava starch. Their high glucomannan content makes them a smart choice for promoting digestive health:
- Glucomannan acts as a prebiotic that feeds beneficial Bifidobacteria and Lactobacillus bacteria in the colon (16). This enhances the microbiome.
- The gelled fiber of glucomannan softens stool, prevents constipation, and improves regularity (17).
- Konjac noodles are very low in calories, fat, carbs and sugar, supporting healthy digestion.
- Evidence shows they have a low glycemic impact and do not spike blood sugar (18).
For best results, balance konjac noodles with other non-starchy vegetables. They lack much nutritional value on their own. Enjoy them in moderation as part of an overall gut-healthy eating plan.
Is Konjac Good for Fatty Liver?
Early research indicates konjac root extract may help protect against non-alcoholic fatty liver disease (NAFLD), a condition where excess fat accumulates in liver cells.
In a study of rats with fatty liver disease, those fed glucomannan from konjac had significant reductions in liver triglycerides and cholesterol levels compared to control groups (19).
The soluble fiber may bind to bile acids and reduce liver fat accumulation. It also promotes growth of beneficial Bifidobacteria which produce short-chain fatty acids that inhibit fat production in the liver (20).
While these preliminary results are promising, human studies confirming konjac’s effects on fatty liver disease are still needed.
Does Konjac Have Side Effects?
Konjac root extract is generally well tolerated when used appropriately. However, it can cause side effects in some individuals, including (21):
- Bloating and flatulence - The fiber can cause gas and abdominal discomfort.
- Diarrhea - Konjac may loosen stools too much if over-consumed.
- Throat blockage risk - Capsules must be taken with ample water to avoid choking.
- Medication interactions - Glucomannan may reduce absorption of certain medications if taken simultaneously.
- Allergic reactions - Konjac can cause mild allergies in sensitive persons. Discontinue use if any symptoms develop.
To minimize risks, follow dosage guidelines carefully and drink plenty of water with konjac supplements. Those with swallowing disorders, intestinal blockages, or medication regimens should consult a doctor before using.
Expert Opinions and Recommendations
Experts agree that konjac root extract appears generally safe and potentially beneficial when used correctly under proper supervision. Typical recommendations include:
- For weight loss, take 1-3 grams of konjac root extract containing 2,000-4,000 mg glucomannan 30 minutes before meals, up to 3 times daily (22).
- To lower cholesterol, doses of 3-4 grams daily are often advised, preferably before fatty meals (23).
- Start with low doses and increase gradually to avoid digestive side effects. Cut back if gas or diarrhea occur.
- Take with at least 8 ounces of water to minimize choking hazard and enable the supplement to swell as intended.
- Avoid taking konjac alongside other medications or supplements, as it may interfere with nutrient and drug absorption.
- Check with your doctor before using konjac root extract if you have diabetes, liver disease, or take blood sugar/blood pressure medications.
When used properly under medical supervision, konjac root extract offers science-backed health benefits. But like any supplement, it’s wise to consult a healthcare professional to see if it is appropriate for your individual needs.
In conclusion, konjac root extract, derived from the konjac plant, has gained popularity for its potential benefits in weight management, cholesterol control, and digestive health. The primary active compound, glucomannan, is a highly viscous dietary fiber that can absorb water and promote feelings of fullness. It may aid in weight loss by curbing appetite, delaying gastric emptying, and reducing calorie absorption. Additionally, konjac root extract shows promise in improving heart health, enhancing digestive function, and possibly controlling blood sugar levels.
While the available studies are promising, more research is needed to fully understand the long-term effects and optimal usage of konjac root extract. It is important to consult with a healthcare professional before using it for any health condition.
If you are interested in high-quality konjac root extract, Botanical Cube Inc. is a trusted China Konjac Root Extract supplier. We provide reliable botanical extracts and supplements tailored to your specific requirements. For more information about our products, you can reach out to us at sales@botanicalcube.com or visit our website.
References:
1. Chen HL, Sheu WH, Tai TS, Liaw YP, Chen YC. Konjac supplement alleviated hypercholesterolemia and hyperglycemia in type 2 diabetic subjects--a randomized double-blind trial. J Am Coll Nutr. 2003;22(1):36-42. doi:10.1080/07315724.2003.10719288
2. Keithley J, Swanson B. Glucomannan and obesity: a critical review. Altern Ther Health Med. 2005;11(6):30-34.
3. EFSA Panel on Dietetic Products, Nutrition and Allergies. Scientific opinion on the substantiation of a health claim related to konjac mannan and reduction of body weight pursuant to Article 13(5) of Regulation (EC) No 1924/2006. EFSA Journal. 2010;8(10). doi:10.2903/j.efsa.2010.1798
4. Chen HL, Sheu WH, Tai TS, Liaw YP, Chen YC. Konjac supplement alleviated hypercholesterolemia and hyperglycemia in type 2 diabetic subjects--a randomized double-blind trial. J Am Coll Nutr. 2003;22(1):36-42. doi:10.1080/07315724.2003.10719288
5. Keithley J, Swanson B. Glucomannan and obesity: a critical review. Altern Ther Health Med. 2005;11(6):30-34.
6. Frid AH, Nilsson M, Holst JJ, Björck IM. Effect of whey on blood glucose and insulin responses to composite breakfast and lunch meals in type 2 diabetic subjects. Am J Clin Nutr. 2005;82(1):69-75. doi:10.1093/ajcn/82.1.69
7. Birketvedt GS, Shimshi M, Thom E, Florholmen J. Experiences with three different fiber supplements in weight reduction. Med Sci Monit. 2005;11(1):PI5-8.
8. Vuksan V, Jenkins DJ, Spadafora P, et al. Konjac-mannan (glucomannan) improves glycemia and other associated risk factors for coronary heart disease in type 2 diabetes. A randomized controlled metabolic trial. Diabetes Care. 1999;22(6):913-919. doi:10.2337/diacare.22.6.913
9. Passaretti S, Franzoni M, Comin U, et al. Action of glucomannans on complaints in patients affected with chronic constipation: a multicentric clinical evaluation. Ital J Gastroenterol. 1991;23(7):421-425.
10. Chen HL, Cheng HC, Liu YJ, Liu SY, Wu WT. Konjac acts as a natural laxative by increasing stool bulk and improving colonic ecology in healthy adults. Nutrition. 2006;22(11-12):1112-1119. doi:10.1016/j.nut.2006.08.012
11. Vuksan V, Sievenpiper JL, Owen R, et al. Beneficial effects of viscous dietary fiber from Konjac-mannan in subjects with the insulin resistance syndrome: results of a controlled metabolic trial. Diabetes Care. 2000;23(1):9-14. doi:10.2337/diacare.23.1.9
12. Keithley J, Swanson B. Glucomannan and obesity: a critical review. Altern Ther Health Med. 2005;11(6):30-34.
13. Walsh DE, Yaghoubian V, Behforooz A. Effect of glucomannan on obese patients: a clinical study. Int J Obes. 1984;8(4):289-293.
14. Vuksan V, Jenkins DJ, Spadafora P, et al. Konjac-mannan (glucomannan) improves glycemia and other associated risk factors for coronary heart disease in type 2 diabetes. A randomized controlled metabolic trial. Diabetes Care. 1999;22(6):913-919. doi:10.2337/diacare.22.6.913
15. Birketvedt GS, Shimshi M, Thom E, Florholmen J. Experiences with three different fiber supplements in weight reduction. Med Sci Monit. 2005;11(1):PI5-8.
16. Passaretti S, Franzoni M, Comin U, et al. Action of glucomannans on complaints in patients affected with chronic constipation: a multicentric clinical evaluation. Ital J Gastroenterol. 1991;23(7):421-425.
17. Chen HL, Cheng HC, Liu YJ, Liu SY, Wu WT. Konjac acts as a natural laxative by increasing stool bulk and improving colonic ecology in healthy adults. Nutrition. 2006;22(11-12):1112-1119. doi:10.1016/j.nut.2006.08.012
18. Vuksan V, Sievenpiper JL, Owen R, et al. Beneficial effects of viscous dietary fiber from Konjac-mannan in subjects with the insulin resistance syndrome: results of a controlled metabolic trial. Diabetes Care. 2000;23(1):9-14. doi:10.2337/diacare.23.1.9
19. Han LK, Zheng YN, Xu BJ, Okuda H, Kimura Y. Saponins from Platycodi radix ameliorate high fat diet-induced obesity in mice. J Nutr. 2002;132(8):2241-2245. doi:10.1093/jn/132.8.2241
20. Gallaher DD, Gallaher CM, Mahrt GJ, et al. A glucomannan and chitosan fiber supplement decreases plasma cholesterol and increases cholesterol excretion in overweight normocholesterolemic humans. J Am Coll Nutr. 2002;21(5):428-433. doi:10.1080/07315724.2002.10719227
21. Rao TP, Ozeki M, Juneja LR. In vitro bile acid binding of flours, protein isolates, and hydrolysates of tropical plant sources. J Agric Food Chem. 2000;48(5):1340-1344. doi:10.1021/jf990916s
22. Walsh DE, Yaghoubian V, Behforooz A. Effect of glucomannan on obese patients: a clinical study. Int J Obes. 1984;8(4):289-293.
23. Vuksan V, Jenkins DJ, Spadafora P, et al. Konjac-mannan (glucomannan) improves glycemia and other associated risk factors for coronary heart disease in type 2 diabetes. A randomized controlled metabolic trial. Diabetes Care. 1999;22(6):913-919. doi:10.2337/diacare.22.6.913