Wheat flour composites prepared by hybridization with microparticulated rice flour (up to 30%) and/or soybean hulls (up to 10%) exhibited unique physical properties and were effective in reducing fat uptake during frying. Although some physical damage occurred to the consisting particles during the hybridization, the matrices of composites had greater rigidity and resistance against pasting and gelatinization, compared to the physical mixtures. The rigid matrices of the composites contributed to reducing the fat uptake of the doughnuts when the composites were used as batters for deep-fat frying. Moreover, the rice flour exhibited a synergistic effect with the soybean hulls in reducing the fat uptake. The composite formation in which wheat flour was dry-coated with rice flour or soybean hulls exhibited significant effects on the physical properties of the deep-fat fried doughnuts prepared with the composite flours.