Recently, I have noticed a new ingredient in many of the cereals I eat.  The additive is a compound called resistant dextrin.  Dextrin is a soluble gummy substance or prebiotic that is obtained by hydrolysis of starch, used as a thickening agent and in adhesives and dietary supplements.  Resistant dextrins are a class of soluble fiber isolated from wheat or corn that is believed to reduce the glycemic response and promote satiety. Dextrins are also believed to also improve insulin resistance and assist in the management of type 2 diabetes.  It is hypothesized to absorb water and should expand the gut and reduce your appetite, but there is limited evidence that prebiotics improves insulin resistance or reduce weight.