This article examines Nutrition Policy and Investment in Sub-Saharan Africa: Cost-Effectiveness and Political Economy: A South Sudan Case Study with a focused emphasis on South Sudan within the field of African Studies. It is structured as a action research study that organises the problem, the strongest verified scholarship, and the main analytical implications in a concise publication-ready format. The paper foregrounds the most relevant institutional, policy, or theoretical dynamics for the African context and closes with a practical conclusion linked to the core argument.