Is Your Diet Silently Damaging Your Brain? New Research Links Ultra-Processed Foods to Hidden Brain Injury

A 2026 JAMA Network Open study of 8,783 adults links higher ultra-processed food intake to hidden vascular brain injury and visceral fat. What it shows, what it doesn't, and practical nutrition steps.

By Jeremy Hicks | Co-Founder & ISSA Certified Nutrition Coach | Rise Wellness & Longevity

What if the foods you eat every day were associated with changes in your brain long before you experienced a single symptom?

When we think about the consequences of poor nutrition, we usually think about weight gain, diabetes, high cholesterol, or heart disease. But what if the effects of our diets extend much further?

A new study published in JAMA Network Open in October 2026 suggests that people who consume higher amounts of ultra-processed foods may have a greater likelihood of developing hidden vascular damage in their brains—even during middle age, before noticeable problems with memory or thinking appear.

As a nutrition coach and co-founder of Rise Wellness & Longevity, I find this research particularly important because it reinforces something I emphasize in our approach to wellness:

Your health isn't determined solely by what you weigh. It's influenced by what happens inside your body, often years before symptoms appear.

And nutrition is one of the most important lifestyle factors we can influence.

What Did the New Research Discover?

Researchers examined data from 8,783 Canadian adults between the ages of 35 and 69 who had no history of cardiovascular disease. Participants completed dietary assessments, and researchers analyzed brain MRI scans for signs of vascular injury.

Compared with participants who consumed the least ultra-processed food, those consuming the most had:

• 40% higher odds of MRI-detected vascular brain injury.
• 1.7 percentage points higher average body fat percentage.
• Greater amounts of visceral fat, the fat stored deep within the abdomen around internal organs.

Interestingly, researchers did not find a consistent association between ultra-processed food intake and performance on cognitive tests. In other words, some participants showed changes in brain structure without measurable differences in memory or thinking.

The association with vascular brain injury was also stronger among women than men in this study.

These findings do not prove that ultra-processed foods directly cause brain injury. The researchers measured diet and health outcomes at one point in time, and some findings varied depending on how ultra-processed food intake was calculated.

Nevertheless, the results raise important questions about how our everyday dietary habits may relate to long-term brain health.

Source: de Souza et al., JAMA Network Open, 2026.

What Is a Silent Stroke?

Most people recognize the classic warning signs of a stroke: facial drooping, arm weakness, difficulty speaking, or sudden changes in vision. But not all vascular damage in the brain produces obvious symptoms.

A silent stroke, also called a covert brain infarct, occurs when blood flow to a small area of the brain is interrupted, causing tissue injury without the recognizable symptoms of a clinical stroke. Researchers can sometimes detect these injuries through MRI scans.

The study also evaluated white matter hyperintensities, which are MRI findings associated with changes in the brain's small blood vessels. These are not necessarily strokes themselves, but they can indicate vascular injury. Both types of findings have been associated in previous research with increased risks of future stroke and cognitive decline.

The concerning part is that someone may feel perfectly healthy while changes in their blood vessels are already occurring. That doesn't mean everyone who eats processed foods will experience a stroke. It means our long-term vascular health deserves attention before symptoms develop.

The Connection Between Ultra-Processed Foods, Inflammation, and Brain Health

To understand why these findings matter, we need to look beyond calories. Many ultra-processed foods contain combinations of refined carbohydrates, added sugars, sodium, and less favorable fat profiles, while providing relatively little fiber and fewer naturally occurring nutrients.

Consider a typical day built around sugary breakfast cereal, packaged snacks, sweetened beverages, and heavily processed convenience meals. That eating pattern may contribute to several interconnected problems.

1. Blood Sugar and Insulin Resistance

Refined carbohydrates and added sugars can contribute to rapid increases in blood glucose, depending on the food and the overall meal. Over time, dietary patterns that promote excess calorie intake and weight gain can contribute to insulin resistance.

Insulin resistance occurs when cells become less responsive to insulin, making it harder for the body to regulate blood sugar effectively. It is closely associated with metabolic dysfunction and increased cardiovascular risk.

Our brain depends on a healthy network of blood vessels to deliver oxygen and nutrients. Maintaining healthy glucose regulation is one important part of protecting that system.

2. Chronic Inflammation

Inflammation is a normal and necessary part of the body's immune response. The problem arises when inflammation becomes chronic.

Excess visceral fat, insulin resistance, and certain dietary patterns can contribute to persistent low-grade inflammation. This inflammatory environment may affect the endothelium—the delicate layer of cells lining our blood vessels. Healthy endothelial function is essential for proper blood flow and vascular regulation.

Researchers are investigating whether metabolic dysfunction and inflammation help explain the relationship between ultra-processed food consumption and vascular brain injury. However, the new study did not establish that inflammation caused the brain changes observed.

3. Visceral Fat: The Fat You Cannot Always See

One finding I consider especially important is the association between ultra-processed food intake and visceral fat. Unlike the fat directly beneath your skin, visceral fat accumulates deeper within your abdominal cavity.

Excess visceral fat is metabolically active and associated with insulin resistance, inflammation, and cardiovascular disease. This is why I encourage people to look beyond the number on the scale.

Two individuals can weigh exactly the same but have very different body compositions and metabolic risk profiles. A healthy weight does not automatically guarantee optimal metabolic health.

At Rise Wellness & Longevity, our philosophy is to consider the bigger picture: nutrition, body composition, physical activity, lifestyle habits, and appropriate clinical measurements.

What Exactly Are Ultra-Processed Foods?

Not all food processing is harmful. Washing vegetables, freezing berries, pasteurizing milk, and canning beans are forms of processing that can make nutritious foods safer and more convenient.

Ultra-processed foods are generally industrial formulations made using ingredients and manufacturing processes that are not typically used in home cooking. Examples include:

• Sugary soft drinks and many energy drinks.
• Sweetened breakfast cereals.
• Packaged snack cakes, cookies, and pastries.
• Instant noodles and certain packaged meals.
• Some processed meats.
• Many highly formulated snack foods.

An important distinction: not every packaged food is unhealthy, and not every ultra-processed product has the same nutritional profile. A product's fiber, protein, sodium, added sugar, and overall nutrient content still matter.

The goal isn't to become afraid of everything that comes in a package. The goal is to build a dietary pattern around foods that provide meaningful nutritional value.

Why I Believe Whole-Food Nutrition Should Come First

At Rise Wellness & Longevity, we believe nutrition and lifestyle should form the foundation of a proactive wellness strategy. Medications and other medical interventions can be valuable when clinically appropriate. But they don't replace the importance of what we eat every day.

Rather than focusing on the latest restrictive diet, I encourage people to prioritize a variety of whole and minimally processed foods. That means building meals around vegetables, fruits, legumes, whole grains, nuts, seeds, and quality protein sources.

These foods provide nutrients that support cardiovascular and metabolic health, including fiber, potassium, magnesium, healthy fats, and a wide range of naturally occurring plant compounds.

We don't need to choose between competing diet labels to recognize the value of nutrient-dense foods. For many people, meaningful progress begins with consistently improving food quality.

Five Practical Ways to Support Your Brain and Metabolic Health

You don't need to completely overhaul your life overnight. In fact, sustainable improvements are often built through small, repeated decisions.

1. Replace One Ultra-Processed Food Each Day

Start with something simple. Replace a sugary breakfast cereal with plain Greek yogurt, berries, and oats. Swap a sweetened beverage for water or unsweetened tea. Choose fruit and nuts instead of a packaged dessert occasionally.

Small substitutions can improve your overall dietary quality without making healthy eating feel overwhelming.

2. Prioritize Fiber

Fiber supports digestive health, helps regulate blood glucose, and can contribute to healthier cholesterol levels. Vegetables, legumes, berries, oats, and whole grains are excellent sources. Most adults would benefit from paying closer attention to their daily fiber intake.

3. Build Meals Around Protein and Plants

Include an appropriate source of protein alongside colorful vegetables, fruit, or other fiber-rich plant foods. Protein supports muscle maintenance, while plant foods provide fiber and essential micronutrients. Maintaining muscle mass and healthy metabolic function becomes especially important as we age.

4. Move Your Body Consistently

Resistance training and cardiovascular exercise both play valuable roles in long-term health. Physical activity can improve insulin sensitivity, help manage body composition, and support cardiovascular function.

You don't need to become an athlete. Find activities you enjoy and can sustain.

5. Know Your Numbers

Pay attention to important indicators of cardiometabolic health, including:

• Blood pressure.
• Blood glucose or A1c when appropriate.
• Cholesterol and other lipid measurements.
• Waist circumference and body composition.
• Physical activity, sleep, and dietary habits.

Discuss appropriate screening with your healthcare professional. These measurements can help identify risk factors that aren't always apparent from how you look or feel.

The Bigger Picture: Longevity Is About More Than Living Longer

When I think about longevity, I don't simply think about adding years to our lives. I think about preserving our ability to enjoy those years.

Our ability to think clearly, remain physically independent, stay active, maintain relationships, and pursue the things that give our lives meaning is incredibly important.

This new research is a reminder that the habits we establish in our 30s, 40s, 50s, and beyond may have implications for our health decades later.

We cannot control every risk factor or guarantee that healthy habits will prevent disease. But we can make decisions that improve our overall health trajectory.

The goal isn't perfection. It's giving our bodies the best possible foundation for a healthier future.

My Final Thoughts

One of the biggest mistakes we can make with our health is assuming that feeling fine means everything inside our bodies is functioning optimally.

The researchers behind this study identified associations between dietary patterns and brain changes in adults without known cardiovascular disease. That doesn't mean we should panic about every processed food we consume. It does mean we should take our everyday nutrition seriously.

I believe the most effective wellness strategies begin with the fundamentals: nourishing our bodies, maintaining muscle, supporting metabolic health, getting adequate sleep, managing stress, and staying physically active.

At Rise Wellness & Longevity, we're passionate about helping people understand those fundamentals and turn them into sustainable habits.

Because longevity isn't simply about adding years to your life.

It's about adding more life to your years.

Frequently Asked Questions

Can ultra-processed foods cause silent strokes?

A 2026 observational study found an association between higher ultra-processed food intake and MRI-detected vascular brain injury. It did not prove that these foods directly cause silent strokes.

What foods are considered ultra-processed?

Ultra-processed foods are industrial formulations such as sugary soft drinks, sweetened breakfast cereals, packaged snack cakes and cookies, instant noodles, some processed meats, and many highly formulated snack foods. Simple processing like freezing, washing, or canning does not make a food ultra-processed.

Can you have brain damage without symptoms?

Yes. Silent strokes (covert brain infarcts) and white matter hyperintensities can appear on MRI scans in people who have no noticeable symptoms. Both have been associated with higher future risk of stroke and cognitive decline.

What is the best diet for brain health?

There is no single perfect diet, but eating patterns built around vegetables, fruits, legumes, whole grains, nuts, seeds, and quality protein—with fewer ultra-processed foods—support cardiovascular and metabolic health, which helps protect the brain's blood vessels.

Ready to Take a More Proactive Approach to Your Health?

At Rise Wellness & Longevity, we believe lasting wellness begins with education, personalized guidance, and sustainable lifestyle changes. Whether you're working to improve your nutrition, manage your weight, support metabolic health, or establish healthier habits for the years ahead, we're here to help you take meaningful steps forward.

Explore our health and nutrition coaching, medical weight-loss care in Prineville, and clinician-guided GLP-1 programs, serving Prineville, Crook County, Central Oregon and patients nationwide.

Jeremy Hicks
Co-Founder | ISSA Certified Nutrition Coach
Rise Wellness & Longevity

Sources

• de Souza RJ, et al. (2026). Ultraprocessed Food Intake and Adiposity, Vascular Brain Injury, and Cognition in Middle-Aged Adults. JAMA Network Open, 9(10), e2639118 — https://doi.org/10.1001/jamanetworkopen.2026.39118
• Population Health Research Institute (2026). Ultra-Processed Food Intake Linked to Silent Strokes in Healthy Middle-Aged Adults, Study Finds — https://www.phri.ca/ultra-processed-food-intake-linked-to-silent-strokes-in-healthy-middle-aged-adults-study-finds/
• National Institute of Neurological Disorders and Stroke — Stroke information and prevention resources — https://www.ninds.nih.gov/health-information/disorders/stroke
• American Heart Association — Life's Essential 8: Recommendations for Cardiovascular Health — https://www.heart.org/en/healthy-living/healthy-lifestyle/lifes-essential-8
• National Institute of Diabetes and Digestive and Kidney Diseases — Insulin Resistance and Prediabetes — https://www.niddk.nih.gov/health-information/diabetes/overview/what-is-diabetes/prediabetes-insulin-resistance

Medical disclaimer: This article is for educational purposes only and is not intended to diagnose, treat, cure, or prevent disease. Research associations do not establish causation. Nutrition coaching does not replace medical evaluation or treatment. Consult a qualified healthcare professional for individualized medical advice.