Ultra-Processed Foods: What They Are, Why They're Harmful, and How to Avoid Them

What are ultra-processed foods?

Ultra-processed foods (UPFs) are industrially formulated products made mostly from substances extracted from foods (oils, fats, sugar, starch, proteins) and derived from food constituents (hydrogenated fats, modified starch), with little or no whole foods. They typically contain additives like preservatives, emulsifiers, artificial flavors, and colors.

The 2025-2030 Dietary Guidelines for Americans now explicitly warn against ultra-processed foods, stating that the guidance "limits highly processed foods, added sugars, and refined carbohydrates."

The NOVA classification system

Researchers use the NOVA system to classify foods by processing level:

Group 1: Unprocessed or minimally processed

Fresh, frozen, dried fruits and vegetables; grains; beans; nuts; seeds; meat, poultry, fish; milk; eggs. These are the foundation of a healthy diet.

Group 2: Processed culinary ingredients

Oils, butter, sugar, salt, used in small amounts to season and cook Group 1 foods.

Group 3: Processed foods

Foods made by adding Group 2 ingredients to Group 1 foods: cheese, fresh bread, canned fish, salted nuts. These can be part of a healthy diet.

Group 4: Ultra-processed foods

Industrial formulations with 5+ ingredients, including substances not used in home cooking: packaged snacks, soft drinks, instant noodles, most breakfast cereals, mass-produced bread, reconstituted meats, instant soups.

Why ultra-processed foods are harmful

1. They promote overeating

The NIH "twinkie study" by Kevin Hall showed that people consumed ~500 more calories per day on an ultra-processed diet compared to a whole-food diet with matched macros. UPFs are engineered to be hyperpalatable, the perfect combination of salt, sugar, fat, and texture that overrides natural satiety signals.

2. They're linked to chronic disease

A BMJ meta-analysis found that higher intake of ultra-processed foods was associated with increased risk of all-cause mortality, cardiovascular disease, metabolic syndrome, and certain cancers.

3. They displace nutritious foods

Every calorie from an ultra-processed food is a calorie that could have come from a whole food with more fiber, vitamins, minerals, and phytochemicals.

How to reduce ultra-processed foods

1. Read ingredient lists: If there are ingredients you can't pronounce or wouldn't find in your kitchen, it's likely UPF
2. Shop the perimeter: Most whole foods (produce, meat, dairy) are on the outer edges of the grocery store
3. Cook at home more often: The single most effective way to reduce UPF intake
4. Replace, don't eliminate: Swap UPF snacks for whole-food alternatives (fruit and nuts instead of granola bars)
5. Don't aim for perfection: Aim for 80% whole foods, 20% flexibility