Tuesday, October 11, 2011
Category : CLAIMS, Non classé, CLINICAL EVIDENCE | Author : experts
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The positive opinion of EFSA on claim relative to glucomannan effect on reduction of body weight asks questions. Indeed, this opinion is supported by 9 clinical studies. These studies are all good quality, randomized, double-blind, placebo controlled. Most of them didn’t bring significant results of beneficial effect of glucomannan on reduction of body weight. However, EFSA brings one more piece of evidence with the Keithley and Swanson study (2005) which informs about mechanism of action of glucomannan.

This ingredient benefits from allowed claim on reduction of body weight by EFSA but is supported by little scientific evidence.

In Japan, konjac (Amorphophallus konjac), from where is extracted glucomannan, is already considered like a functional food since many years thanks to published studies proving its efficacy on reduction of body weight and other applications.

EFSA Panel on Dietetic Products, Nutrition and Allergies (NDA); Scientific Opinion on the substantiation of health claims related to konjac mannan (glucomannan) and reduction of body weight (ID 854, 1556, 3725), reduction of post-prandial glycaemic responses (ID 1559), maintenance of normal blood glucose concentrations (ID 835, 3724), maintenance of normal (fasting) blood concentrations of triglycerides (ID 3217), maintenance of normal blood cholesterol concentrations (ID 3100, 3217), maintenance of normal bowel function (ID 834, 1557, 3901) and decreasing potentially pathogenic intestinal microorganisms (ID 1558) pursuant to Article 13(1) of Regulation (EC) No 1924/2006. EFSA Journal 2010;8(10):1798. [27 pp.].

Keithley J and Swanson B. Glucomannan and obesity: a critical review. Alternative Therapies in Health and Medicine. 2005;11:30-34.

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