This invention relates to nutritional high fibre food ingredient "Nestogen", comprising whole grain cereals such as wheat bran 68.57 weight percent, barley 14.29 weight percent and herbs such as ashwagandha 14.29 weight percent, shatavari 2.86 weight percent with distinct specifications and the process of preparing the same suitable for application into nutritional health foods for human use, and more especially to an improved method of producing a cereal-based food constituent having highly desirable nutrient properties.