Ultra Processed Foods: What Are They and What Is Their Impact?
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Walk down any grocery store aisle, and you'll notice shelves brimming with ultra processed foods – brightly packaged snacks, frozen dinners, sweetened artificial cereals and sugary drinks. These convenient, ready-to-eat products have become staples in many households, thanks to their long shelf-life, affordability and flavors that keep you coming back for more.
But behind their widespread popularity lies a more complicated story. Research suggests that ultra processed foods, while convenient, may have health consequences, especially on the gut and brain. From altering gut microbiota to potentially influencing cognitive and emotional well-being, their impact goes far beyond calories and convenience.
In this blog, we speak to Mitchell Maddox, M.D., a board-certified family medicine physician with INTEGRIS Health Medical Group Moore.
“Avoiding processed foods and following a Mediterranean-style diet is a great way for people to reduce weight and prevent heart disease and diabetes,” Maddox says. “The American Heart Association guidelines recommend a diet rich in fruits, vegetables, whole grains, beans, nuts and seeds, and minimizing processed foods in favor of whole foods. As a primary care doctor, I am passionate about helping patients feel confident in managing their health.”
What are ultra processed foods?
What to know: Ultra processed foods are industrial products made mainly from extracted food substances such as oils, fats, sugars and proteins, often through chemical processes. They usually lack whole food ingredients and are high in added sugars, unhealthy fats, salt and various hard-to-pronounce additives to improve taste, texture and shelf life.
Ultra processed foods is a recent term for foods that are highly processed in factories, containing ingredients and chemicals with little nutritional value.
- They are made from substances not commonly used in home cooking, such as high-fructose corn syrup, hydrogenated oils, flavor enhancers and emulsifiers.
- Common examples include sugary drinks, packaged snacks, instant noodles, reconstituted meat products and ready-to-eat meals.
Data examined from 2001 to 2018 indicated ultra processed foods accounted for 57 percent of the caloric intake for adults.
- These foods are often energy-dense and nutrient-poor, meaning they provide many calories with little nutritional value.
Characteristics of ultra processed foods
Ultra processed foods typically share similar characteristics.
- They usually contain a long list of ingredients, often ranging from 10 to 20 or more.
- They often contain many additives – preservatives, artificial colors, flavors and emulsifiers – to enhance taste, texture and shelf life.
- They are often rich in added sugars, unhealthy fats and salt.
- Extensive industrial processing is used, often involving substances extracted from foods or synthesized chemically.
Common ingredients used in ultra processed foods
When reviewing product packaging, any of the following ingredients are usually an indicator of ultra processed foods.
- Added sugars (high fructose corn syrup, glucose syrup, dextrose and sucrose) to improve flavor.
- Unhealthy fats (hydrogenated oils and heavily refined fats).
- Refined starches (corn starch and modified starches).
- High quantities of salt (monosodium glutamate, sodium nitrite) for flavor and preservation.
- Preservatives (sodium benzoate and potassium sorbate) to improve shelf life.
- Artificial colors and flavors (red 40, yellow 5, ethyl maltol and diacetyl) to enhance appearance and taste.
- Emulsifiers and stabilizers (lecithin and carrageenan) to improve texture and prevent ingredients from separating.
- Protein isolates (soy protein isolate and whey protein concentrate) to enhance protein content and improve texture consistency.
Classifying processed foods
The basics: The NOVA classification is a system developed to categorize foods based on the extent and purpose of their processing. It helps in understanding the impact of food processing on health and nutrition.
The NOVA classification system was developed by researchers at the University of São Paulo in Brazil, led by Carlos Monteiro, a prominent public health nutritionist.
- The four categories include unprocessed foods, processed culinary ingredients, processed foods and ultra processed foods.
- The system emerged in response to the growing recognition of the impact of food processing on health, beyond just the nutrient content of foods.
- NOVA classification has been recognized and used by international health organizations, including the Food and Agriculture Organization (FAO) and the Pan American Health Organization (PAHO).
- However, in the U.S., organizations such as the Food and Drug Administration (FDA) and the Department of Agriculture (USDA), haven’t adopted this due to challenges related to regulatory complexity, industry influence and ongoing scientific discussions.
Unprocessed or minimally processed foods
These natural foods are either whole foods or have been slightly altered to make them suitable for storage and consumption but retain their original properties.
- Examples include fresh fruits and vegetables, grains, nuts, seeds, eggs, milk and fresh meat.
- Minimal processing methods include cleaning, peeling, slicing, juicing, drying and pasteurization.
Processed culinary ingredients
This group includes substances extracted from natural foods or obtained from nature, used to prepare, season and cook foods.
- They are typically not consumed on their own but are used in cooking.
- Examples include oils, butter, sugar and salt.
- These ingredients undergo processes like pressing, refining, grinding and milling.
Processed foods
Processed foods are made by adding sugar, oil, salt or other culinary ingredients to unprocessed or minimally processed foods.
They usually have two or three ingredients and are designed to enhance the durability or modify the taste of foods.
- Examples include canned vegetables, fruits in syrup, cheeses and freshly baked bread.
- Processing methods include canning, bottling and fermentation.
Ultra processed foods
These industrial formulations have at least five or more ingredients.
- They undergo multiple processing steps and include substances not commonly used in home cooking, such as preservatives, emulsifiers, artificial flavors and colors.
- They are designed to be convenient, palatable and long-lasting.
- Examples include soft drinks, packaged snacks, instant noodles and ready-to-eat meals.
The allure of ultra processed foods
Key points: Ultra processed foods have a strong allure for many consumers, primarily due to their affordability, convenience and taste.
Convenience is typically the biggest draw, as these foods require little to no preparation.
- This convenience appeals to individuals with hectic schedules who lack the time or means to cook homemade meals.
Affordability plays a role, too, as ultra processed foods are often cheaper than fresh, whole foods.
- This affordability makes them an attractive option for individuals and families on a tight budget.
- The low cost is largely due to the use of inexpensive ingredients and large-scale production processes that reduce manufacturing expenses.
The taste of ultra processed foods keeps consumers coming back for more.
- They are engineered to be highly palatable, often containing high levels of sugar, salt and fat to enhance flavor.
- This combination can be addictive, encouraging repeat purchases and consumption due to satisfying cravings and providing immediate sensory gratification.
Marketing and promotions help create brand identities and emotional connections with consumers.
- Advertising campaigns often highlight the fun, convenience and taste of these products, making them more appealing.
- Eye-catching packaging with bright colors and engaging graphics, along with strategic placement in stores, can attract shoppers' attention.
- Some ultra processed foods are marketed with health claims, such as being all natural, low-fat or fortified with vitamins, which can mislead consumers into perceiving them as healthier options.
The dangers of ultra processed foods
Why it matters: Eating ultra processed foods regularly can pose several health risks due to their nutritional composition and the presence of additives. New studies have found a link between ultra processed foods and many health conditions.
Meta analysis in 2024 published by the British medical journal BMJ found diets high in ultra processed foods are linked to 32 health conditions.
Based on the study, here are the percentage increases in risk associated with higher intake of ultra processed foods:
- Cardiovascular disease-related mortality: 50 percent higher risk.
- Type 2 diabetes: 12 percent higher risk (dose-response) and 40 percent higher risk (non-dose-response).
- Anxiety: 48 percent higher risk.
- Common mental disorders: 53 percent higher risk.
- All-cause mortality: 21 percent higher risk.
- Heart disease-related mortality: 66 percent higher risk.
- Obesity: 55 percent higher risk.
- Adverse sleep outcomes: 41 percent higher risk.
- Depression: 22 percent higher risk.
A new observational study found a link between ultra processed foods and a higher risk of cognitive impairment and stroke.
- In fact, just a 10 percent increase in eating ultra processed foods led to the effects.
Additives in ultra processed foods impact gut health, primarily through their effects on the gut microbiota and intestinal functions.
- Gut microbiota alteration can lead to dysbiosis (an imbalance in the microbial community) due to emulsifiers, artificial sweeteners and artificial colors.
- Intestinal inflammation, especially when chronic, increases the risk of chronic intestinal illnesses such as inflammatory bowel disease, colorectal cancer and irritable bowel syndrome.
Various ingredients in ultra processed foods can impact cognitive health.
- Chronic gut inflammation from high sugar intake and unhealthy fats can lead to neuroinflammation (inflammation of the brain), which is associated with cognitive decline and an increased risk of neurodegenerative diseases such as Alzheimer's and Parkinson's.
- Since a healthy gut microbiome is essential for producing neurotransmitters in the brain, any dysregulation can impact mood and cognitive function.
- A combination of nutrient deficiency and chronic inflammation from additives is also linked to a higher rate of anxiety and depression.
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