Initiatives on tackling food insecurity among global emerging economies are being focused on enriching native staple foods with locally available nutritious underutilized crops. The objective of this study was to optimize protein content and dietary fibre in rice (Oryza sativa) flour using Sorghum (Sorghum bicolor L.) and Bamboo shoots (Yushania alpina). An extreme vertices How to cite this paper: Wanjala, W.N., Mary, O. and Symon, M. (2020) Optimization of Protein Content and Dietary Fibre in a Composite Flour Blend Containing Rice (Oryza sativa), Sorghum [Sorghum bicolor (L.) Moench] and Bamboo (Yushania alpina) Shoots. Food and Nutrition Sciences, 11, 789-806.