Chitosan is a dietary fiber derived from chitin. Chitin is an aminopolysaccharide (combination of sugar and protein) that comes from the shells of shellfish. Chitin used to be nothing more than a waste product of the shellfish industry, but a bit of chemical treatment and ¨C Voila! ¨C a new fiber is born. Chitosan is typically found in dietary supplements for reducing cholesterol levels and promoting weight loss.

Because chitosan is a positively charged compound, it is able to attract and bind to fatty acids (which carry a negative charge). As such, chitosan can absorb up to 4-6 times its weight in fat (including cholesterol) and prevent that fat from being absorbed into the body. This means that for every gram of chitosan that you consume as a supplement, you¡¯ll prevent the absorption of about 4-6 grams of fat (a very rough approximation). If you¡¯re consuming 3-5 grams of chitosan each day, you could be blocking anywhere from 100-300 fat calories from ever being absorbed. The only catch is that the chitosan has to be in your digestive system at the same time as the fat ¨C so typical recommendations are for consumption along with fatty meals (like pizza with extra cheese).

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1.The majority of research on chitosan has been done in animals ¨C where it has been shown to effectively bind to fats in the digestive tract and prevent their absorption.
2.As a supplement to promote a mild reduction in fat absorption and serum levels of LDL cholesterol, chitosan appears to be effective. As a weight loss agent, however, chitosan only appears to offer benefits when used in conjunction with a low-fat, reduced calorie diet. As such, chitosan supplements should not be expected to deliver significant weight loss effects unless significant dietary alterations are followed.

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