Chitosan and white kedney bean for fat prevent

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was wondering what you guys think of and how u use these products , if i were doing a low carb diet threw the week and ate some cheese could the chitosan prevent that saturated fat froom being absorbed and to what degree and does it prevent the good fats from being used, and say u used the white kidney when you ate some veges could this prevent the carbs and to what degree, do yall think its helps much worth it?