NOVA Food Classification: The 4 Groups Explained in Plain English

NOVA is a food classification framework developed in 2009 by a team led by Carlos Monteiro at the University of São Paulo in Brazil. Unlike traditional nutrition labels, NOVA ignores calories, fat, and vitamins entirely. It sorts foods into four groups based on one question: how much industrial processing went into making this, and for what purpose? That single shift in perspective made NOVA the dominant framework in ultra-processed food research, cited in hundreds of studies and adopted in dietary guidelines from Brazil to France.

Group 1 covers unprocessed and minimally processed foods. This means fresh, frozen, dried, or fermented foods with nothing added: apples, brown rice, plain milk, eggs, frozen peas, dried lentils, plain yogurt, fresh fish, coffee beans. Chilling, freezing, grinding, and pasteurizing all count as minimal processing because they preserve the food without changing its fundamental nature.

Group 2 covers processed culinary ingredients: substances extracted from Group 1 foods or from nature and used in kitchens to cook. Olive oil, butter, honey, salt, maple syrup, and cane sugar all live here. You rarely eat Group 2 items on their own. They exist to season and prepare Group 1 foods.

Group 3 covers processed foods: Group 1 foods with Group 2 ingredients added, typically for preservation. Canned tomatoes, tuna in olive oil, salted peanuts, traditional cheese, cured ham made with only pork and salt, and bakery bread made from flour, water, salt, and yeast are all Group 3. The recognizable food is still the star. For the full picture, see our NOVA group 3 foods guide.

Group 4 covers ultra-processed foods: industrial formulations built from extracted substances like protein isolates, modified starches, and hydrogenated oils, held together with additives such as emulsifiers, colors, and flavorings. Soft drinks, packaged snacks, instant noodles, reconstituted meat products, and most supermarket sandwich bread qualify. Our complete NOVA 4 foods list breaks this group down aisle by aisle, and our processed food list shows Groups 3 and 4 side by side in the store.

The confusion between Group 3 and Group 4 trips up almost everyone. The practical test is the ingredient list. If it reads like a recipe you could follow at home, you are likely in Group 3. If it includes substances you have never seen in a kitchen, soy protein isolate, maltodextrin, carboxymethylcellulose, artificial flavor, you are in Group 4. Cheese versus processed cheese slices, and canned corn versus corn puffs, illustrate the line clearly.

NOVA has critics, and their arguments are worth knowing. Because it classifies by processing rather than nutrients, a fortified whole grain cereal and a soda land in the same group, which some nutrition scientists find too blunt. Others argue the category boundaries are fuzzy for edge cases like plain packaged tofu. Still, a 2024 BMJ umbrella review of 45 pooled analyses keeps finding that diets heavy in Group 4 foods are associated with higher rates of obesity, type 2 diabetes, and cardiovascular disease, which is why bodies like the FAO have applied NOVA in their reporting on global diet quality.