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Chitosan is a type of fiber which is made from the shells of crustaceans, such as shrimp, lobster, squid or crab. The human body does not digest fiber well, and as it passes through the digestive tract it can bind fats. This causes them to be unabsorbed, too. Since chitosan is a fiber, it was thus hypothesized that it could be effective for weight loss by reducing fat absorption.

The majority of studies done have not confirmed this, however. In fact, in the largest double-blind placebo-controlled study done with the supplement, 250 overweight individuals who received 3 mg of chitosan daily for 6 months did not show any significant weight loss when compared to those individuals in the placebo group.

Are there any adverse consequences to taking chitosan?

Yes.

It has been shown that high doses of chitosan taken over a long period of time can cause the depletion of several important minerals, such as calcium, magnesium, selenium, and vitamins A, D, E and K. Since all these are needed for bone growth, a depletion can set the stage for the development of osteoporosis.

There has also been a report of arsenic poisoning originating from chitosan supplementation. Apparently crustacean shells can contain arsenic which unknowingly can become part of the chitosan supplement. Taken over a long period of time, toxicity and eventually death can occur.

Bottom Line: Short term use of chitosan (i.e., several weeks) is more than likely not a problem. Its not likely to be much help with weight loss. Not for pregnant women and children, however!

Sue Roberts, MPH MS RD/CN is a certified nutritionist and registered dietitian.

Get a copy of her FREE ebook, "The secrets about Weight Loss supplements: What You Need to Know" at http://www.YourOnlineNutritionist.com .