Food is any nutritious substance that people eat or drink. What is and is not food is relative to what provides nourishment to the human body. This definition helps us to focus on the fact that food is always relative to human nutrition. Thus, food systems should be understood as a broader category than simply agriculture, as agriculture is primarily focused on the production of food, whereas food systems engender the full lifecycle of food production and consumption. A food system is then a set of interconnected elements for the production, processing, distribution, consumption and disposal of food. These elements may be ecological, technological, economic or social institutions.