Pizza is a processed food, and most of the pizza people actually eat, whether frozen from a store or ordered from a chain restaurant, qualifies as ultra-processed. Where a specific pizza falls on the processing spectrum depends entirely on how it’s made and what goes into it. A simple pizza assembled at home from scratch with flour, yeast, tomatoes, and cheese is minimally processed at most. A frozen pizza loaded with preservatives, modified starches, and flavor enhancers is a different product entirely.
How Food Processing Is Classified
The most widely used system for categorizing food by its level of processing is called NOVA, developed by nutrition researchers and used by public health agencies worldwide. It breaks all food into four groups.
- Group 1: Unprocessed or minimally processed foods. These are whole foods altered only by basic methods like washing, cutting, freezing, or roasting. Fresh tomatoes, mozzarella milk, and wheat kernels fall here.
- Group 2: Processed culinary ingredients. Things like olive oil, salt, sugar, butter, and flour. You wouldn’t eat them alone, but you use them to cook Group 1 foods.
- Group 3: Processed foods. These combine Group 1 foods with Group 2 ingredients using simple methods like baking, canning, or fermenting. Freshly made bread, basic cheeses, and canned vegetables are examples.
- Group 4: Ultra-processed foods. These are industrial formulations made mostly from substances derived from foods (modified starches, hydrogenated oils, protein isolates) plus additives like emulsifiers, flavor enhancers, and colorings. Little intact whole food remains.
A homemade pizza using fresh dough, tomato sauce, and real cheese sits comfortably in Group 3. It’s processed, but in the same straightforward way that bread or cheese is processed. Pre-prepared frozen pizza, however, is explicitly listed in the NOVA system as a Group 4 ultra-processed food, alongside soft drinks, reconstituted meat products, and packaged snacks.
What Makes Most Pizza Ultra-Processed
The difference between a processed pizza and an ultra-processed one shows up on the ingredient label. If you flip over a frozen pizza box, you’ll typically find ingredients that no home cook would use: high-fructose corn syrup, modified food starch, hydrogenated oils, soy protein isolate, maltodextrin, and various emulsifiers. These are industrial substances designed to extend shelf life, improve texture, and enhance flavor in ways that whole ingredients can’t.
A useful rule of thumb: if the ingredient list includes flavors, flavor enhancers, emulsifiers, thickeners, or modified oils, the product is ultra-processed. The same goes for protein sources like hydrolyzed proteins, whey protein isolate, gluten additives, or “mechanically separated meat” in meat toppings. These ingredients exist almost exclusively in ultra-processed products. A short ingredient list of recognizable foods (flour, water, yeast, salt, tomatoes, mozzarella) signals a less processed product.
Chain restaurant pizza occupies a gray area. It’s made from real dough and cheese, but the dough often contains dough conditioners, the sauce may include added sugars, and the cheese might be a blend with modified starches. The processing level varies by restaurant, but many large pizza chains use ingredients and techniques that push their products toward the ultra-processed end of the spectrum.
Sodium Levels Across Different Pizzas
One of the clearest nutritional differences between pizza types is sodium content. Data from the National Health and Nutrition Examination Survey shows that store-bought (frozen) pizza averages about 559 milligrams of sodium per 100 grams, while restaurant pizza averages 640 milligrams per 100 grams. For context, 100 grams is roughly one small slice.
Meat toppings push those numbers higher. Frozen meat pizza averages 573 mg per 100 grams, and restaurant meat pizza hits 652 mg. Even plain cheese pizza from a restaurant contains about 601 mg per 100 grams. A typical two-slice serving from a restaurant delivers well over 1,000 mg of sodium, nearly half the recommended daily limit of 2,300 mg. Pizza is one of the single largest contributors to sodium intake in the American diet, with restaurant pizza alone accounting for 14% of all sodium consumed from restaurant sources.
Health Concerns With Ultra-Processed Foods
The processing level of your pizza matters because a large body of evidence links ultra-processed food consumption to poor health outcomes. A narrative review covering 43 studies found that 37 of them tied higher ultra-processed food intake to at least one adverse health outcome. In adults, these included obesity, heart disease, type 2 diabetes, certain cancers, irritable bowel syndrome, depression, and higher rates of death from all causes. In children and adolescents, the associations included metabolic risk factors and asthma.
Pizza is frequently cited in this research as a representative ultra-processed food. That doesn’t mean eating pizza occasionally causes these conditions. The concern is about dietary patterns where ultra-processed foods, pizza among them, make up the bulk of what someone eats day after day. The 2025 U.S. Dietary Guidelines took the unprecedented step of explicitly warning Americans to “avoid highly processed packaged, prepared, ready-to-eat, or other foods that are salty or sweet,” marking the first time the guidelines directly called out ultra-processed foods as a category to limit.
How to Make Pizza Less Processed
Pizza doesn’t have to be ultra-processed. The simplest version, dough made from flour, water, yeast, and salt, topped with crushed tomatoes and real mozzarella, contains nothing that would qualify it as ultra-processed. It’s a straightforward combination of basic ingredients that people have been making for centuries.
If you’re buying rather than making, the ingredient label is your best tool. Look for frozen pizzas with short ingredient lists built around recognizable whole foods. Skip anything listing hydrogenated oils, high-fructose corn syrup, flavor enhancers, or long chemical-sounding additives. Some smaller frozen pizza brands now market specifically on having clean ingredient lists, and the difference is real. A frozen pizza with ten ingredients you recognize is a fundamentally different product from one with forty ingredients, half of which require a chemistry degree to pronounce.
When ordering from a restaurant, local pizzerias that make dough and sauce in-house tend to use fewer processed ingredients than large national chains. You can also reduce sodium by choosing vegetable toppings over processed meats like pepperoni and sausage, which are themselves ultra-processed and sodium-dense.