The method in accordance with claim 1, wherein mixing the endosperm from step (d), the germ from step (e), the fine bran from step (f-i), and the pulverized bran from step (f-ii) to obtain a whole-wheat flour is performed in an in-line mixer wherein the endosperm, the germ, the fine bran, and the pulverized bran are run through individual high-precision flow meters, whereby these flow meters are operationally connected to a flow controller, before the ingredients are mixed in an in-line mixer.