What is the NOVA Food Classification System?
To understand what over-processed foods are called, it is essential to first understand the NOVA food classification system. Developed by Brazilian scientists, this widely used system categorizes all food and drink into four groups based on the extent and purpose of their processing. This framework provides a clear and consistent method for nutritionists, researchers, and consumers to discuss the topic of food processing beyond the simple 'processed' label.
The four NOVA categories:
- Group 1: Unprocessed and minimally processed foods. These are foods in their natural state or that have been altered minimally to extend shelf life or aid preparation. Examples include fresh vegetables, fruits, eggs, meat, milk, and dried legumes.
- Group 2: Processed culinary ingredients. These are substances derived from Group 1 foods through processes like pressing, grinding, or refining. They are not meant to be eaten alone but are used in cooking. Examples include salt, sugar, oils, and butter.
- Group 3: Processed foods. These are relatively simple products made by combining Group 1 and Group 2 items. The purpose is preservation or to make them more palatable. Examples include canned vegetables, fresh bread (with few ingredients), and cheese.
- Group 4: Ultra-processed foods (UPFs). This is the category for over-processed foods. They are industrial formulations typically made from ingredients derived from foods or synthesized in labs, along with numerous additives.
Why are ultra-processed foods different?
Unlike processed foods (Group 3), which are recognizable versions of their original form, UPFs are engineered products with a long list of ingredients that would rarely be found in a home kitchen. The industrial processes used to create them are designed to create hyper-palatable, convenient, and long-lasting products that are often low in nutrients and high in fat, sugar, and salt.
Common characteristics of ultra-processed foods:
- High Palatability: UPFs are formulated to be highly appealing to the senses, triggering the brain's reward centers and encouraging overconsumption.
- Long Ingredient List: Look for long lists that include substances you do not recognize, such as hydrogenated oils, modified starches, hydrolyzed proteins, and various cosmetic additives like emulsifiers and artificial flavorings.
- Industrial Additives: The presence of additives to enhance flavor, texture, and appearance is a hallmark of UPFs. These include sweeteners, colors, and preservatives that would never be used in a home-cooked meal.
- Ready-to-Eat Convenience: Most UPFs are designed for maximum convenience—ready to eat, heat, or drink with minimal preparation.
Examples of ultra-processed foods and common misconceptions
It is important to recognize that the UPF category includes a wide variety of products, some of which might surprise you. While obvious culprits like candy, soda, and packaged snacks are included, less obvious examples also fall into this category due to industrial processing and additives.
Comparison of process levels
| Feature | Minimally Processed Foods (NOVA 1) | Ultra-Processed Foods (NOVA 4) |
|---|---|---|
| Processing Level | Minimal alteration (e.g., washing, freezing). | Extensive industrial processing involving multiple steps. |
| Ingredient List | Simple or non-existent (e.g., fresh fruit). | Long list with industrial ingredients and additives. |
| Nutritional Density | High in natural nutrients, fiber, and vitamins. | Often high in calories, sugar, salt, and unhealthy fats; low in fiber and nutrients. |
| Goal of Production | Preserve natural food state and facilitate use. | Maximize shelf life, profitability, and palatability. |
| Examples | Fresh fruits, vegetables, eggs, plain yogurt. | Sugary cereals, sodas, packaged cakes, many ready meals. |
The health implications of consuming UPFs
Growing research, including a 2024 meta-analysis in The BMJ, consistently links high UPF consumption to numerous negative health outcomes. While isolating the exact mechanism of harm is challenging, potential factors include the high levels of fat, sugar, and salt, the presence of various additives, and the lack of essential nutrients and fiber. The hyper-palatability of these products can also drive overeating, contributing to weight gain and obesity.
How to reduce ultra-processed foods in your diet
Reducing UPF intake can be a gradual process involving mindful shopping and cooking. Reading ingredient labels is one of the most effective strategies. Look for foods with shorter, simpler ingredient lists. Small swaps can make a big difference. For instance, choosing plain yogurt and adding fresh fruit instead of buying pre-sweetened versions, or opting for home-cooked meals over packaged ready-to-heat dinners. While completely eliminating UPFs may not be realistic for everyone, focusing on balancing your diet with more minimally processed options can lead to significant health improvements.
Conclusion
In summary, over-processed foods are officially known as ultra-processed foods (UPFs), a designation from the globally recognized NOVA classification system. These industrially formulated products are distinct from minimally processed foods and are identifiable by their complex ingredient lists, high palatability, and frequent lack of natural nutritional value. By understanding what are ultra-processed foods, consumers can make more informed dietary choices to promote better health and well-being. Focusing on whole, minimally processed foods remains a cornerstone of a healthy, balanced diet. Learn more about the NOVA classification system here.