1) The document summarizes the acute food and nutrition insecurity situation in the Sahel and West Africa region based on analysis from 15 countries. 2) It finds that from October-December 2020, over 16.7 million people were estimated to be in Crisis or Emergency (Phase 3-5) situations, increasing to over 23.6 million from June-August 2021. 3) The key drivers of food insecurity included the impacts of COVID-19, conflict and insecurity (especially in the Lake Chad Basin and Liptako Gourma zones), and economic factors like high food prices.