The Short Answer: Research shows that a diet high in processed foods significantly increases the risk of early death, particularly for people managing chronic illnesses like autoimmune conditions. The study found that every 10% increase in processed food consumption was linked to a 14% higher chance of early death—primarily from cancer and heart disease.

What the Research Shows About Processed Foods and Early Death

New research demonstrates that eating processed foods regularly raises the risk of an earlier death. We already know in functional medicine that a processed foods diet typically leads to chronic diseases such as diabetes, obesity, heart disease, autoimmune diseases, including Hashimoto’s low thyroid, high blood pressure, dementia, and Alzheimer’s.

The study, published in JAMA Internal Medicine, tracked 44,000 adults in their late 50s for eight years. On average, about a third of the participants’ diets consisted of processed foods, including:

• Instant noodles
• Instant soups
• Breakfast cereals
• Energy bars and drinks
• Chicken nuggets
• Ready-made meals and snacks
• Packaged snack foods
• Any foods made using industrial processing

During the study periods, more than 600 subjects died, most from cancer and heart disease. When researchers examined the deaths while adjusting for general health, socioeconomic status, and dietary compliance, a clear trend emerged: the more processed foods a person ate, the more likely they were to die earlier. Every 10% increase in processed food consumption was associated with a 14% higher risk of early death.

Why High-Temperature Processing Damages Your Health

The authors of the study identify two primary mechanisms explaining this increased mortality risk.

High-temperature processing forms contaminants. Heating food at ultra-high temperatures alters protein structures in a way that makes them unrecognizable to the human body, triggering an inflammatory reaction. High temperatures also make industrial oils used in processed foods toxic. For people managing autoimmune conditions, this inflammatory trigger can exacerbate existing immune dysregulation.

Additives can be carcinogenic. Food additives are lab-produced chemicals not found naturally in the food chain and foreign to the human body. These chemicals can bind to proteins, forming new compounds that are unrecognizable to the immune system. Many are difficult to metabolize and eliminate, thus increasing the inflammatory burden and toxic load. Chemical food additives have been linked to brain-based symptoms and disorders, which is a concern for anyone managing chronic illness.

How Processed Foods Damage Your Brain and Immune System

In functional medicine, we understand that processed foods undermine health through several interconnected mechanisms that are particularly damaging for people with autoimmune conditions.

Industrial oils compromise brain health. The brain consists primarily of fat, and the fats you consume directly determine your brain’s health. Industrial oils used in food processing are generally rancid due to their fragile structure. Consuming them contributes to poor neuronal integrity and reduced brain health. They’re also inflammatory to both body and brain. The hydrogenated fats in many processed foods are linked with cognitive decline, heart disease, and systemic inflammation—compounding the inflammatory burden already present in autoimmune disease.

Dangerous omega fatty acid ratios. Industrial oils are extremely high in omega-6 fatty acids. Humans need a ratio of omega-6 to omega-3 fatty acids of approximately 4:1 (ideally 1:1). Most Americans consume a ratio of 25:1 due to the industrial oils in processed foods. This excess omega-6 promotes inflammation and accelerates chronic disease progression.

Unstable blood sugar from refined carbohydrates. Processed foods are loaded with refined carbohydrates that destabilize blood sugar, one of the biggest promoters of chronic disease, dementia, and autoimmune flares. Blood sugar dysregulation taxes the immune system and worsens inflammatory responses.

Hidden gluten in processed foods. Most processed foods contain gluten. Many people aren’t aware they have gluten sensitivity or celiac disease. As a result, eating gluten keeps the body in a state of chronic inflammation. Gluten is linked with over 55 diseases, many of them autoimmune, including Hashimoto’s low thyroid, making it particularly problematic for people managing immune dysregulation.

Making the Shift to Whole Foods

Following a whole foods diet is the most effective way to reduce mortality risk and improve your health when managing a chronic illness. Whole foods allow your immune system to function properly, reduce inflammatory burden, and support stable energy and cognitive function.

Contact RedRiver Health and Wellness to work with a functional medicine doctor who understands how diet affects autoimmune health and chronic disease.