The present invention is a nutrient delivery system including an extruded fiber source. Extruding fibers causes many changes to the structure and function of the fiber. Many of these changes make it possible to include higher levels of the extruded fiber source in food products, substantially without a concomitant adverse effect on the functional or organoleptic properties of the food product, as compared to using unextruded fiber sources. Some of the changes that occur during the extrusion of a fiber source may affect its affinity for water in the food product. The nutrient delivery system of the present invention can be used to prepare food products that meet US FDA and other regulatory guidelines for food nutrition labeling.