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What we eat every day can also affect the way the brain ages. In adults, especially as the years go by, greater adherence to the Mediterranean diet has been associated with better integrity of the white matter, the tissue that allows the different areas of the brain to communicate with one another. The most recent studies also point to possible favourable effects on inflammatory processes, on the health of the small blood vessels and on metabolism. Scientific interest stems from a precise question: can proper nutrition help keep the brain efficient for longer? The available evidence suggests that it can, without turning diet into a therapy or a guarantee against cognitive decline.
What white matter is and why it matters
The brain contains grey matter and white matter. Grey matter holds most of the cell bodies of nerve cells. White matter is made up mainly of the fibres that connect the different areas of the brain to one another.
We can think of it as a network of connections. One area processes a piece of information, another needs to receive it. Memory, attention, movement and the ability to make decisions also depend on the quality of these connections.
With age, small brighter areas called white matter hyperintensities, or WMH, may appear in the white matter on magnetic resonance imaging. They are often associated with changes in the small vessels of the brain. A high burden of these alterations has been linked, in prospective studies, to a greater risk of decline in cognitive abilities.
Their presence, however, cannot predict on its own what will happen to a person. Age, blood pressure, blood sugar, smoking, physical activity and cardiovascular health all form part of the same picture.
The 2026 study: Mediterranean diet and white matter
One of the most interesting findings comes from a study published in Neurology in May 2026. The researchers analysed 2,642 Hispanic or Latino adults living in the United States, with an average age just over 64.
Diet had been assessed through a score of adherence to the Mediterranean diet. Years later, the participants underwent brain magnetic resonance imaging, including techniques able to study the very fine structure of the white matter.
Those who followed the Mediterranean pattern more closely had, on average, a lower volume of white matter hyperintensities. The study also found a greater overall volume of white matter, a smaller amount of free water in the tissues and better values of fractional anisotropy, a parameter used to assess the organisation of nerve fibres.
In simple terms, the images showed brain connections that were, on average, better preserved in people with greater adherence to the Mediterranean diet.
It should be remembered that this is an observational study. It demonstrates a statistical relationship; it does not prove that the diet, on its own, produced those differences.
A result supported by earlier studies
The 2026 finding fits into a line of research that has been under way for several years.
In the Northern Manhattan Study, conducted on 966 people with available dietary data and an average age of 72, greater adherence to the Mediterranean diet had already been associated with a lower volume of white matter hyperintensities.
In 2020, a study of 76 adults aged at least 50 had observed better microstructural integrity of the white matter in people who adhered more closely to the Mediterranean diet. In the same group, better results had emerged in executive functions, those we use to plan, control attention and make decisions.
In 2025 came a meta-analysis of 20 studies, covering a total of 44,893 people. Overall, greater adherence to the Mediterranean diet was associated with a lower burden of white matter hyperintensities. The same researchers, however, did not find a significant and consistent association with all the other parameters studied, such as total brain volume, grey matter, overall white matter volume and hippocampus.
The research therefore offers promising results, which nevertheless call for cautious interpretation.
The brain also depends on the health of its vessels
One possible explanation directly concerns blood circulation.
The brain accounts for only a small part of body weight, yet it continuously needs oxygen and nutrients. A dense network of blood vessels supplies it.
The Mediterranean diet acts on numerous factors linked to vascular and metabolic health. Vegetables, pulses, fruit, wholegrain cereals, nuts, fish and extra virgin olive oil take the place of a larger share of processed meats, saturated fats, sugars and highly processed foods.
This dietary pattern has been associated with better cardiovascular, metabolic and inflammatory control. Protecting the vessels means creating favourable conditions for the brain and its white matter as well.
Blood sugar and the brain speak the same language
Another element concerns blood sugar control.
In the DIRECT PLUS trial, 284 adults were randomly assigned to different dietary and lifestyle programmes for 18 months. Two groups followed versions of the Mediterranean diet. One was particularly rich in polyphenols.
Among participants aged at least 50, the Mediterranean groups showed smaller age-related brain changes than the group that followed general healthy eating guidelines. Improvement in insulin sensitivity was one of the factors most strongly associated with the smaller loss of brain volume observed.
A later analysis of the same trial, published in 2024, linked better blood sugar control and a reduction in C-reactive protein to more favourable indicators of brain age.
Nutrition, metabolism, circulation and the brain are therefore closely connected.
Neuroinflammation: what it means
The word neuroinflammation can be frightening, especially when it is used without explanation.
The brain has its own immune cells, called microglia. They monitor the brain environment and step in when they detect damage or danger.
A temporary inflammatory response is part of the body’s normal defences. The problem arises when certain inflammatory signals remain active for a long time and contribute to altering the balance of the tissues.
Oxidative stress, metabolic alterations, cardiovascular health and systemic inflammation may take part in this process. Nutrition and lifestyle therefore become a subject of study because they can modify some of these factors.
Can the Mediterranean diet reduce neuroinflammation?
The research indicates that it may help limit some of its mechanisms, while direct evidence in humans is still incomplete.
A meta-analysis published in 2025 gathered 33 randomised clinical trials, with a total of 3,476 participants. Compared with control diets, the Mediterranean diet produced significant reductions in some markers of inflammation, including high-sensitivity C-reactive protein, interleukin 6 and interleukin 17. Other markers, including TNF-alpha, showed no significant changes.
This demonstrates a possible effect on inflammation in the body. Neuroinflammation and inflammation measured in the blood, however, are not the same thing.
Other elements come into play in the brain. Experimental studies suggest that the polyphenols found in foods typical of the Mediterranean diet may influence microglial activity. Much of this evidence still derives from cellular and experimental models, so caution is needed in transferring it directly to everyday life.
Polyphenols, omega 3 and antioxidants: the dietary pattern matters
When we talk about nutrition and the brain, we often tend to look for a single food able to explain everything.
The Mediterranean diet is instead studied as an overall pattern. Here are some of the food groups of the Mediterranean diet:
These elements act within the same dietary context. They may influence oxidative stress, fat and sugar metabolism, vessel function and inflammatory signals. The effects of an entire diet, therefore, can hardly be reduced to the action of a single substance.
The gut joins the conversation
Research is paying growing attention to the gut-brain axis.
Our diet changes the composition and activity of the intestinal microbiota. The bacteria in the gut produce substances that may interact with metabolism, the immune system and, indirectly, the brain.
The fibre in vegetables, fruit, pulses and wholegrain cereals favours the production of metabolites such as short-chain fatty acids. Research is evaluating their possible role in regulating immune responses and neuroinflammatory processes.
These mechanisms are still under study and their clinical application requires further confirmation. Speaking today of a single ideal microbiota for the brain would be premature.
The Mediterranean diet in everyday life
Following the Mediterranean diet means above all building a habit.
Fish and nuts feature regularly in the diet. Red meat, cured meats, sweets, sugary drinks and ultra-processed foods take up less space.
Quantity remains as important as quality. Age, physical activity, body composition, any metabolic alterations and energy requirements make it unreasonable to apply the same pattern to everyone.
Nutrition education serves to turn correct general principles into habits suited to the individual person.
Brain health is built over time
The brain changes throughout life. Thinking about its health only when memory difficulties appear means stepping in when many factors have already been at work for years.
Blood pressure, blood sugar, physical activity, sleep, smoking, diet and body composition produce effects that build up over time.
Research on the Mediterranean diet suggests a precise perspective: eating well is one of the tools through which we can take care today of the brain we will use tomorrow.
The most recent observational studies show an association between greater adherence to the Mediterranean diet and better indicators of white matter. In 2026 a study of 2,642 adults found fewer hyperintensities and better microstructural parameters in people with greater adherence. The association, on its own, does not demonstrate a direct relationship of cause and effect.
They are areas that appear brighter in particular magnetic resonance imaging sequences. They may increase with age and are often linked to the health of the brain’s small vessels. A high burden is associated with a greater risk of cognitive decline.
The potential benefit concerns the pattern as a whole: vegetables, fruit, pulses, wholegrain cereals, extra virgin olive oil, nuts and fish. The research advises against the idea of a single “superfood”.
Extra virgin olive oil provides monounsaturated fats and polyphenols. Trials and reviews have observed favourable effects on some cardiovascular and inflammatory markers. These mechanisms could also contribute to brain health.
Omega 3s play important roles in cell membranes and are found mainly in oily fish and in some plant foods. Their presence within a balanced diet is of interest for brain health, while the effect of individual supplements varies according to the person and the context.
Yes. Persistent alterations in glucose metabolism are associated with vascular and brain health. In the DIRECT PLUS trial, improved glycaemic control was associated with more favourable markers of brain ageing.
Diet can modify some inflammatory signals, oxidative stress, metabolism and the gut microbiota. All these systems can interact with the brain. Direct evidence on neuroinflammation in humans remains, however, more limited than that on systemic inflammation.
As early as possible. Brain health is built over time. Blood pressure, blood sugar, physical activity, diet and other modifiable factors begin to leave traces long before old age.
No. Diet is one part of lifestyle. Physical activity, sleep, control of cardiovascular factors, cognitive stimulation and social relationships each play a role too. Reviews of clinical studies show interesting results for the Mediterranean diet, together with evidence that is still heterogeneous.
The general guidelines of the Mediterranean diet apply to many people, while quantities, energy requirements and the composition of meals change according to age, physical activity, body composition and individual metabolic conditions. For this reason a professional assessment makes it possible to turn a sound dietary pattern into a programme that is truly sustainable.
Nutrition and Postural Education: learn today what you need to live longer and in good health
At Lucia Magnani Health Clinic, Nutrition and Postural Education starts from a specific, personalised assessment. The aim is to identify the habits to improve and to provide tools that can also be used once back in everyday life. In the Long Life Formula® programmes, nutrition education in fact includes the assessment of dietary errors, the definition of the most suitable regimen and the learning of proper self-management over time. Longevity is built above all through what we learn to do every day.
