Functional Fiber Marine Sourced Dietary Supplement Lifestyle Care Marine Based Fat Flush Some studies suggest that a diet rich in fiber can help reduce the transit time of foods in the digestive system so less fat is available to be absorbed. Additionally, chitosan is not digestible and therefore has no caloric value. Taken before meals, fiber may help provide nutritive support for healthy lifestyle management. What is Chitosan? Chitosan is an insoluble or non-digestible fiber. Marine sourced chitosan is produced from chitin, which is part of the shells of crustaceans including shrimp, crabs, and lobsters.