Ultra-processed food is more than half the average American adult's calories. Here's what actually counts.
Federal data puts ultra-processed food at more than half the average American adult's calories, and two studies out this month add fresh evidence for why; here's how to tell from a label what actually counts, how strong the evidence really is, and where a realistic change pays off.
The average American adult gets 53% of their daily calories from ultra-processed food. Between the ages of 19 and 39, the band this newsletter is written for, the number is 54.4%. That is most of a person's diet, measured in calories, according to the most recent national nutrition survey. 1
Two studies published in the last two weeks went after what that does to a body.
The first comes from Virginia Tech, published in Nature Metabolism. Fifty-seven healthy-weight adults each ate two 300-calorie meals on separate days. The meals were matched within 1% on carbohydrate, fat, protein, calories, water and salt, and differed in one thing: how processed the food was. The ultra-processed tray held a bite of peanut butter and jelly sandwich, deli turkey, veggie chips, a cookie, cereal and instant mashed potatoes. The plainer tray held a sliced banana, dried cranberries, cheese and an egg. 23
Every metabolic measure the team took came back different. The ultra-processed meal triggered a much bigger insulin release, kept blood sugar higher for longer, and burned less carbohydrate for fuel. The lead author's summary of the results was that the team was shocked. 3
The second study, published September 23 in JAMA Psychiatry, took 20 people already in treatment for depression and had them cut their ultra-processed food by more than 85% for four weeks, then switch back. Their depression scores improved moderately to largely on three separate measures while they ate that way, and anxiety improved slightly. The team, at UC San Francisco, describes it as the first study to compare the same people on both diets. 45
Both studies are small, and their limits matter. Before any of that lands, though, a more basic question has to be answered: what actually counts?
What "ultra-processed" means on a label
The term comes from a system called NOVA, which sorts food by how much industrial processing it went through. 1 There are four groups.
Group 1 is food close to the state it left the ground or the animal in: fresh vegetables and fruit, eggs, plain milk, plain meat, dried beans. Group 2 is the ingredients a kitchen extracts from those and cooks with — oil, sugar, salt, butter, honey. Group 3 is food preserved by adding Group 2 items, which covers canned beans, salted nuts, cheese, and a loaf made from flour, water, salt and yeast. 16
Group 4 is the one worth learning. Ultra-processed products are industrial formulations: substances extracted from foods and then reassembled, usually with additives that make the result taste richer, look brighter and keep longer. 16
The researchers who defined the category also wrote the test for spotting it. Read the ingredient list. If it names a single item that does not live in a normal kitchen, the product is ultra-processed. That means either an industrial food substance — high-fructose corn syrup, hydrogenated or interesterified oil, hydrolyzed protein, whey protein, maltodextrin, dextrose, mechanically separated meat — or a cosmetic additive, the category that covers flavors, flavor enhancers, colors, emulsifiers, sweeteners, thickeners and glazing agents. 6
Applied to real packages, the test produces answers people tend to resent:
- Bread. Flour, water, salt and yeast make it a Group 3 food. Add an emulsifier or a color and the same loaf becomes Group 4. 6
- Breakfast cereal. Plain oats sit in Group 1. Oats with added sugar are Group 3. Oats with an added flavor or color are Group 4. 6
- Flavored yogurt, most protein bars, plant milks with stabilizers, and jarred pasta sauce with added sugar and natural flavors all land in Group 4, whatever the front of the package promises about protein or gut health. 6
The test asks about ingredients and construction. What the nutrition panel says about sugar, salt and calories is a separate question. Pasteurizing milk, freezing vegetables, canning beans and fermenting dough are all processing, and each one makes food safer or longer-lasting. 6 The group that carries the risk is the one defined by what it is built out of.
Where the calories actually come from
The five biggest sources of ultra-processed calories for American adults are worth reading closely, because they move the problem out of the snack aisle. 1
| Source of ultra-processed calories, U.S. adults | Share of total daily calories |
|---|---|
| Sandwiches, including burgers 1 | 8.6% |
| Sweet bakery products 1 | 5.2% |
| Sweetened beverages 1 | 4.4% |
| Savory snacks 1 | 3.4% |
| Breads, rolls and tortillas 1 | 3.1% |
A sandwich, something from a bakery case, a sweetened drink, a bag of chips, a roll. That is an ordinary Tuesday. The first four entries together account for more of the average adult's daily calories than a dessert and a candy habit combined. 1
One piece of good news sits in the same report: adult intake fell from 55.8% in 2013–2014 to 53.0% in the most recent survey. 1
What the evidence actually shows
The largest single body of evidence is a 2024 umbrella review in The BMJ. It pooled 45 meta-analyses covering roughly 9.9 million people and found that higher ultra-processed food intake was associated with worse results on 32 of the 45 health parameters examined, a list that runs through death, cancer, and mental, respiratory, cardiovascular, gastrointestinal and metabolic health. 7
The strongest associations were with death from cardiovascular disease, type 2 diabetes, anxiety, and a combined category the authors call common mental disorders. The review graded that tier of evidence convincing, with a 50% higher risk of cardiovascular death sitting at the top of the range alongside it. A tier below, it found highly suggestive links to death from any cause, death from heart disease, depression, poor sleep, wheezing and obesity. 7
Then comes the qualifier that keeps all of it from being a verdict. Every one of those 45 analyses was observational: it followed what people ate and what happened to them over years. That kind of study spots patterns well and proves cause poorly, because people who eat a lot of ultra-processed food also tend to sleep less, move less and smoke more, and no statistical adjustment removes all of that overlap. When the authors graded the underlying quality, 22 of the 45 came out low and 19 very low. Four were moderate. 7
Closing that gap is what the two new studies were designed to do. Their design is the closest research gets to isolating cause: the same person, two meals, one variable.
| Study | What they did | What they found | What it leaves open |
|---|---|---|---|
| Virginia Tech, Nature Metabolism, October 2026 23 | 57 healthy-weight adults aged 18 to 45 ate two 300-calorie meals matched within 1% on carbs, fat, protein, calories, water and salt; 32 completed the full metabolic and brain-imaging sessions | The ultra-processed meal produced a bigger insulin release, higher blood sugar for longer, more energy burned and less carbohydrate burned; brain reward regions responded differently to pictures of food | One meal, three hours, a small group of young healthy people. It shows a plausible mechanism; decades of eating sit outside what one meal can demonstrate |
| UC San Francisco, JAMA Psychiatry, September 2026 45 | 20 people in treatment for depression cut ultra-processed food by more than 85% for four weeks, then switched back | Depression scores improved moderately to largely on three separate measures; anxiety improved slightly | 20 people with an average age of 44, all with a high BMI and at least one metabolic condition such as diabetes or high blood pressure. Enrolment for a larger trial is expected in 2028 |
What to do with that
The realistic goal is a smaller share of it, and the good news is that the leverage is concentrated.
The CDC's list of top sources doubles as a shopping list, and four of the five entries have a swap that costs about the same money and the same minutes:
- Lunch. A shredded rotisserie chicken, a can of tuna or a few boiled eggs, on bread whose ingredient list stops at flour, water, salt and yeast, covers three days of sandwiches.
- The drink. Seltzer, sparkling water, or coffee you sweeten yourself. Sweetened drinks are 4.4% of the average adult's daily calories and this is the swap with the least effort attached to it.
- The bakery case and the snack drawer. A banana with peanut butter, a handful of nuts, plain yogurt with fruit. Same hand-to-mouth motion, a shorter ingredient list.
- Bread. Look for the loaf whose ingredient list stays short. The emulsified ones are the Group 4 loaves. 6
Two caveats belong with that list. Cost and time are real constraints, and the cheapest, fastest calories on the shelf are usually the ultra-processed ones — that is a food-system problem that lands on you anyway. And scientists are still working out which part of ultra-processing does the damage. The BMJ review lays out the candidates: the altered physical structure of the food, the additives, contaminants from the packaging, and the plain fact that these products are energy-dense and nutrient-poor. 7 Until that is resolved, buying the brand with fewer additives is a bet on one of four possible mechanisms.
One guardrail belongs here too. Changing what you eat is a reasonable thing to do, and it is a poor treatment for depression. If your mood has been low for weeks, the diet study is a reason to eat well and a reason to talk to someone.
When this stops being about food
Depression is diagnosed on a pattern: symptoms most of the day, nearly every day, for at least two weeks, with at least one of them being a low mood or a loss of interest in things you used to enjoy. 8 The rest of the list includes sleeping too much or too little, appetite swinging either way, persistent tiredness, feeling hopeless or irritable, aches and digestive trouble with no clear cause, pulling away from people, and drinking or using more than usual. 8
If that describes the last month, see a clinician or a mental health provider. The guidance is to go at the earliest sign. 8
There is one more reason to have low mood looked at by someone who treats it. Eating disorders show up as changes in how someone eats, and a project of cutting foods out is a natural place for one to hide. 9
The signs worth naming:
- Making yourself throw up, or using laxatives or enemas, after eating
- Exercising intensely to compensate for what you ate, or fasting afterward
- Eating unusually large amounts in one sitting, in secret, then feeling ashamed or guilty
- Eating very little to the point of steady weight loss, or an intense fear of gaining weight
- Seeing yourself as overweight when you are not
Anorexia nervosa has the highest death rate of any mental disorder, and all three of the main eating disorders have treatments that work. 9
If you have thoughts of hurting yourself, call or text 988. The line is free, confidential and answered 24 hours a day. 810 For immediate danger, call 911. 8
The short version
- Ultra-processed food is 53% of the average American adult's daily calories, and 54.4% between the ages of 19 and 39. 1
- The practical test is the ingredient list. One item a kitchen does not use — an industrial food substance or a cosmetic additive — makes the product Group 4. 6
- Most of those calories come from ordinary food: sandwiches and burgers, bakery items, sweetened drinks, snacks and bread. 1
- The evidence is large and consistent on the pattern, observational in its design, and mostly graded low quality. Two new studies add a mechanism without settling the long-term question. 247
- Pick two swaps from the list and keep them. That beats ten swaps kept for four days. 1
- Low mood that has lasted two weeks and is affecting your days is a medical problem with a treatment, and 988 is there if it gets dark. 8
References
- 1
- 2
- 3Ultraprocessed Foods Alter Metabolism and Brain Activity — Virginia Tech
technologynetworks.com
- 4
- 5
- 6
- 7
- 8Depression — MedlinePlus
medlineplus.gov
- 9Eating Disorders — MedlinePlus
medlineplus.gov
- 10988 Suicide & Crisis Lifeline
988lifeline.org
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