Ultra-processed foods are industrial formulations made mostly or entirely from substances extracted from whole foods, combined with additives you wouldn’t find in a home kitchen. They make up 55% of the calories Americans consume daily, and that number climbs to nearly 62% for children and teenagers. Think chips, soda, instant soup, mass-produced breads, packaged pastries, and store-bought ice cream.
How the NOVA System Classifies Food
The term “ultra-processed” comes from the NOVA classification system, developed by nutrition researchers in Brazil, which sorts all food into four groups based on the extent and purpose of processing.
- Group 1: Unprocessed or minimally processed foods. Fresh fruits, vegetables, plain oats, eggs, meat, milk. These have been cleaned, cut, pasteurized, or frozen but not fundamentally altered.
- Group 2: Processed culinary ingredients. Oils, butter, sugar, salt, flour. These are extracted from Group 1 foods and used in cooking but rarely eaten on their own.
- Group 3: Processed foods. Made by combining Groups 1 and 2 through canning, bottling, or simple preservation. Canned tuna, cheese, salted nuts, fruits in syrup, smoked fish, and ham all fit here.
- Group 4: Ultra-processed foods. Industrial formulations that typically contain little or no whole food. They rely on food-derived substances (protein isolates, hydrogenated oils, modified starches) plus cosmetic additives designed to make the final product look, taste, and feel appealing.
The core idea behind the classification is food matrix degradation. Ultra-processing breaks food down into isolated chemical components, then reassembles them into something new. The result is what researchers describe as “a-cellular compounds,” meaning the original cell structure of the food has been completely destroyed.
How to Spot One on a Label
The simplest method is to scan the ingredients list for items you’d never use in a home kitchen. If the list includes flavor enhancers, emulsifiers, emulsifying salts, artificial colors, sweeteners, thickeners, anti-foaming agents, or glazing agents, the product is ultra-processed. These are sometimes called “cosmetic additives” because their job is to imitate the sensory qualities of real food or to mask undesirable traits of the product itself.
A useful comparison: bread made from wheat flour, water, salt, and yeast is a processed food. The same bread with added emulsifiers or artificial colors crosses into ultra-processed territory. Plain steel-cut oats are minimally processed. Oats with added sugar become processed. Oats with added flavors or colors become ultra-processed. The line is drawn not by the base ingredient but by what’s been done to it and what’s been added.
Health Risks Linked to High Consumption
A 2024 umbrella review, which pooled data from multiple large meta-analyses, found that the strongest evidence links ultra-processed food consumption to cardiovascular death and type 2 diabetes. People with the highest intake had a 50% greater risk of dying from cardiovascular disease and a 12% higher risk of developing type 2 diabetes for each incremental increase in consumption, compared to those who ate the least.
The same review found highly suggestive evidence connecting ultra-processed foods to a 21% increase in all-cause mortality, a 66% higher risk of heart disease death, and a 55% increased likelihood of obesity. Separate research on cancer survivors found that those who ate the most ultra-processed food by weight had a 48% higher rate of death from any cause and a 57% higher rate of death from cancer, compared to those who ate the least.
Mental health outcomes also showed strong associations. High ultra-processed food consumption was linked to a 48% increase in anxiety, a 53% increase in common mental health disorders, and a 22% higher risk of depression. Sleep problems and respiratory issues like wheezing also appeared more frequently in people eating the most ultra-processed food.
Why These Foods Drive Overeating
Ultra-processed foods are engineered to combine certain ingredients, particularly fat, sugar, and salt, at levels that create a highly rewarding eating experience. This combination appears to bypass your body’s normal satiety signals, the internal cues that tell you you’ve had enough. In buffet studies, people eating these calorie-dense, highly palatable foods take longer to feel full and consume more total calories than those eating less processed options. The result is what researchers call “passive overconsumption,” where you take in more energy than your body needs without consciously choosing to overeat.
This isn’t just about willpower. The food itself is formulated to be easy to eat quickly. The original structure of the ingredients has been broken down, so there’s less chewing, less volume per calorie, and less fiber to slow digestion. Your brain’s reward system responds to the flavor combination, while your gut doesn’t register fullness at the same pace it would with whole food.
What Happens in Your Gut
Ultra-processed foods are typically low in dietary fiber, which is the primary fuel source for beneficial gut bacteria. Without enough fiber, these bacteria can’t produce the short-chain fatty acids that help maintain a healthy intestinal lining. Over time, this shifts the gut toward a less diverse, more inflammatory microbial environment.
The emulsifiers commonly used in ultra-processed foods, ingredients like carboxymethylcellulose, polysorbate 80, and carrageenan, appear to cause additional damage. These additives reduce populations of anti-inflammatory bacteria while promoting the growth of opportunistic organisms. Animal studies show that emulsifier exposure thins the protective mucus layer lining the intestine, increasing what’s sometimes called “leaky gut,” where bacteria and inflammatory molecules cross from the gut into the bloodstream. This can trigger low-grade inflammation throughout the body, which over time contributes to metabolic problems like obesity and type 2 diabetes.
These emulsifiers also alter how gut bacteria behave at the genetic level, increasing their production of inflammatory molecules that further damage the intestinal barrier. The effect compounds with prolonged exposure, making regular consumption more consequential than an occasional indulgence.
How Much Americans Are Eating
CDC data from August 2021 through August 2023 shows that Americans aged one year and older get 55% of their total daily calories from ultra-processed foods. Children and teenagers consume even more, averaging 61.9% of daily calories from these products, compared to 53% for adults. These numbers mean that for most Americans, ultra-processed food isn’t an occasional convenience. It’s the foundation of the diet.
This is partly by design. Ultra-processed foods are shelf-stable, inexpensive, heavily marketed, and ready to eat with minimal preparation. They dominate grocery store aisles, school cafeterias, gas stations, and vending machines. Reducing intake requires navigating a food environment built to make these products the default choice, which is why public health researchers increasingly frame ultra-processed food as a systems-level problem rather than an individual one.
Practical Ways to Reduce Your Intake
You don’t need to eliminate every ultra-processed food overnight. Start by reading ingredients lists rather than just nutrition labels. The calorie count and macronutrient breakdown won’t tell you whether something is ultra-processed, but the ingredients list will. Look for flavors, colors, emulsifiers, sweeteners, and thickeners, especially clustered near the end of the list.
Swapping within categories often works better than overhauling your entire diet. Choose plain oats over flavored instant packets. Pick bread with a short, recognizable ingredients list. Replace flavored yogurt with plain yogurt and add your own fruit. When buying canned or jarred foods, check whether the ingredients are just the food itself, oil, salt, or water, which would make them processed rather than ultra-processed. These substitutions keep meals practical while meaningfully shifting the balance of what you eat toward less industrially modified food.