Optimized crop distributions in Egypt increase crop productivity and nutritional standards, reducing the irrigation water requirement.

Feeding a growing population with healthy food while preserving the natural ecosystem's resources is a critical challenge of our century. In Egypt, the increasing demand for food commodities and the intensive consumption of freshwater resources by the agricultural sector is hindering the food system capability to achieve sustainable food and nutrition security. The Egyptian government has recently prioritized the improvement of dietary supply through the efficient use of the locally available natural resources. However, strategies to transform the Egyptian agri-food system towards the sustainable satisfaction of healthy dietary needs have not been yet studied. Here, a novel approach has been introduced, able to combine the environmental advantages of an optimized crop allocation with the benefits of providing a healthy diet. First, a physically based agro-hydrological model is used to assess the crop water needs associated with the current cropland and diet (baseline). Subsequently, a linear optimization crop allocation algorithm is designed to replace crops in order to maximize green water productivity, while meeting the dietary requirements of the EAT-Lancet diet. Our results show that through an optimized crop allocation entailing the production of healthy and varied food, it is possible to reach an average 95 % satisfaction of the demand for healthy food items by local agricultural products, with an 8 % reduction in local freshwater consumption and a 90 % increase in crop profitability. Our study suggests the prioritization of the promotion of the dietary guidelines by the EAT-Lancet Commission at the national level in Egypt, to support human health against malnutrition and the development of a more sustainable and efficient food system.