The Nova classification is a framework for grouping edible substances based on the extent and purpose of food processing applied to them. Researchers at the University of São Paulo, Brazil, proposed the system in 2009. Nova classifies food into four groups:
Group 1: Unprocessed or minimally processed foods - Unprocessed foods are edible parts of plants and animals, along with algae, fungi, and water...
Group 2: Processed culinary ingredients - Processed culinary ingredients are derived from group 1 foods or else from nature by processes such as pressing, refining, grinding, milling, and drying. It also includes substances mined or extracted from nature....
Group 3: Processed foods - Processed foods are relatively simple food products produced by adding processed culinary ingredients (group 2 substances) such as salt or sugar to unprocessed (group 1) foods. Processed foods are made or preserved through baking, boiling, canning, bottling, and non-alcoholic fermentation...
Group 4: Ultra-processed foods - Ultra-processed foods are formulations of ingredients, mostly of exclusive industrial use, typically created by series of industrial techniques and processes. Unprocessed (group 1) foods often compose a small proportion of their ingredients or are even lacking entirely. Ultra-processing often introduces food substances of little or no culinary use, such as hydrogenated oil, modified starch, protein isolate, and high-fructose corn syrup. The manufacturing processes for ultra-processed foods typically involve techniques such as extrusion, moulding, and pre-frying, along with the addition of various cosmetic additives, including those for flavour enhancement and colour...
