The NOVA food classification system helps consumers understand not just what they eat, but how much that food has been altered before it reaches their plate.
Developed by researchers at the University of São Paulo in Brazil, the framework shifts attention away from calories and nutrients and toward the degree of industrial processing, a factor increasingly linked to modern health issues such as obesity, diabetes, and cardiovascular disease. Instead of asking whether a food is plant-based or animal-based, NOVA asks a more fundamental question: how far has this product drifted from its original form?
The NOVA food classification divides foods into four groups. Group 1 covers unprocessed and minimally processed items, including fresh fruits and vegetables, whole grains, beans, eggs, plain dairy products, and raw nuts. These foods may undergo simple steps like washing, freezing, or pasteurization, but their structure remains largely intact. They form the backbone of nutrient-rich diets with minimal interference from industrial techniques.
Group 2 consists of processed culinary ingredients derived from Group 1 foods or natural sources, including oils, butter, sugar, salt, honey, and starches. On their own, they are rarely eaten, but they make cooking possible. A spoonful of oil, a pinch of salt, or a little sugar transforms raw ingredients into meals without turning them into industrial products.
Group 3 represents processed foods made by combining Group 1 items with Group 2 ingredients. These foods undergo modest preservation or preparation steps, including fermenting, canning, salting, or baking, and usually come with short, familiar ingredient lists. Cheese made from milk, salt, and enzymes; bread made with flour, water, salt, and yeast; canned beans; and plain yogurt with a touch of sugar generally fall into this group. Many of these can easily fit into balanced diets when ingredients are kept simple.
Group 4, the most heavily scrutinized, includes ultra-processed foods. These are engineered products composed of substances rarely found in home kitchens, including industrial fats, protein isolates, modified starches, emulsifiers, artificial colors, and flavorings. Convenience, hyper-palatability, and long shelf life drive their design.
Soft drinks, instant noodles, packaged cookies, energy bars made from isolates, frozen pizzas, chicken nuggets, and plant-based burgers designed from reconstituted ingredients all exemplify the last group. Their long ingredient lists and engineered textures reflect processing meant to mimic whole foods or create entirely new ones.
Research continues to link high consumption of ultra-processed foods to poorer health outcomes. A meta-analysis published in Nutrients found that diets rich in Group 4 products contain more sugar, salt, and saturated fat, yet less fiber, protein, and a wide range of vitamins and minerals. People who rely heavily on ultra-processed foods often end up consuming energy-dense diets that are low in essential nutrients, such as potassium, magnesium, vitamin C, vitamin E, and vitamin B12.
Importantly, the NOVA food classification is not designed to replace nutrition labels. Instead, it offers a complementary perspective. A handful of almonds may be high in calories, but remain a minimally processed Group 1 food. A low-calorie diet soda, on the other hand, belongs to Group 4 because it is built from artificial sweeteners, flavorings, and other additives. Understanding both the processing level and the nutritional content provides a fuller picture of what someone is consuming.
Misconceptions often cloud interpretations of NOVA. For example, ultra-processed does not automatically mean fast food or junk food. A vegan protein bar made from soy protein isolate, artificial sweeteners, emulsifiers, and glucose syrup is still ultra-processed despite being marketed as healthy or plant-based.
Similarly, homemade foods are not automatically better if the ingredients themselves are ultra-processed. A pasta dish made from tomatoes, herbs, olive oil, and cheese typically falls within Groups 1 to 3, but homemade nachos, built on flavored chips and processed cheese sauces, rely on Group 4 ingredients regardless of preparation.
Processing itself is not the villain. Freezing vegetables after harvest helps preserve nutrients. Pasteurizing milk protects consumers from harmful pathogens. Traditional fermentation, as used in yogurt or kimchi, improves digestion and enhances flavor while keeping foods within Groups 1 or 3. The NOVA food classification highlights concern when processing breaks food down into industrial building blocks, then reconstructs it with additives to simulate taste, texture, and color.
In plant-based diets, the NOVA food classification varies widely. Whole plant foods such as lentils, oats, nuts, tofu, and tempeh fall into the minimally processed or traditionally processed categories. Conversely, vegan cheese slices made from refined starches, oils, and stabilizers, as well as plant-based burgers designed from isolates and flavorings, are considered ultra-processed. The NOVA system emphasizes that “plant-based” does not always mean minimally processed.
Practically applying NOVA begins at the grocery store. Ingredient lists serve as one of the clearest indicators of processing level. Short lists with recognizable items suggest Groups 1 to 3. Long lists filled with unfamiliar additives typically indicate Group 4. A helpful question for shoppers is whether the food could reasonably be recreated at home with basic tools and ingredients.
Still, the NOVA framework has limitations. It does not assess portion size, calorie balance, or the frequency with which a person eats a certain food. Nor does it distinguish between the safety or risk of specific additives. Instead, it excels at capturing broad dietary patterns. Across populations, diets dominated by ultra-processed foods consistently correlate with higher obesity rates, type 2 diabetes, cardiovascular disease, and even elevated all-cause mortality. These trends help guide policymakers in shaping school meal guidelines, food subsidy programs, and packaging regulations.
Ultimately, the NOVA food classification provides a reference point for understanding processing levels within the broader context of nutrition. It pairs best with established approaches that consider long-term habits, physical activity, sleep, stress, and individual health needs. The overarching message remains simple: prioritize minimally processed and traditionally prepared foods, avoid letting ultra-processed items become the default, and make choices within the broader context of a balanced lifestyle.
