An evaluation of changes to protein supply in Zambia between 1961 and 2013 shows consistent dominance of plant-based sources

Dietary protein is essential to maintain optimum growth and maintenance of body muscles in humans (Reference Bauer, Biolo and Cederholm1). Although animal sources of protein have a higher biological value and protein digestibility than most foods (Reference Hoffman and Falvo2), they are beyond the economic reach of many, especially those living in the global south. However, protein from animal sources is environmentally unsustainable, and excess consumption of red and processed meats are associated with increased risk of non-communicable diseases (Reference Nijdam, Rood and Westhoek3). Using Zambia as a case study, this study aimed to assess the supply of protein from various food sources to meet population-level requirements, including changes that have occurred over time...