The present invention relates generally to a method of blunting the postprandial glycemic response to a meal by feeding a dual induced viscosity fiber system. The first component of the induced viscosity fiber system is soluble fiber. The second component of the induced viscosity fiber system is water-insoluble, acid-soluble multivalent cations. The third component of the induced viscosity fiber system in lightly hydrolyzed starch. The fiber system will typically be incorporated into a meal replacement nutritional. The present invention also refers to a method of delivering soluble fiber to diabetics and to persons needing to lose weight. Additionally, the invention refers to a method of promoting the feeling of fullness and satiety by feeding a nutritional product containing the induced viscosity fiber system.