An emulsion system and method for controlling the digestion of a fat or an oil component is provided including a substantially hydrophobic food-grade component, and at least one of an emulsifier component, and one or more of polymeric components, wherein at least one of the emulsifier component and the polymeric component comprises a substantially indigestible food-grade material, such as an indigestible dietary fiber. The emulsifier component and/or the polymeric component can be selected so that the overall interfacial membrane is indigestible to humans and/or animals.