Scientists are uncovering stronger links between everyday habits and neurological disease, with new research examining why diet, exercise, sleep and environmental pollution matter to the ageing brain.
The food on your plate, the quality of your sleep and the air you breathe could all influence your chances of developing dementia later in life. A scientific review published in February 2026 has examined how these everyday factors affect the brain, adding to growing evidence that neurological health is not determined by genetics alone.
Published in Frontiers in Pharmacology, the research, conducted by scientists at the University of Bern in Switzerland, brings together findings on nutrition, environmental pollution and lifestyle habits, and their relationship with conditions including Alzheimer’s disease, Parkinson’s disease and cognitive decline.
The findings offer a more detailed understanding of how the brain changes over time and why some people may be more vulnerable to neurological disease than others. Although ageing and inherited risk remain important, researchers increasingly recognise that diet, cardiovascular health, physical activity and environmental exposure can influence the biological processes involved in brain deterioration.
One of the most interesting findings concerns the Mediterranean diet, long associated with cardiovascular health but now attracting considerable attention in neuroscience.
A traditional Mediterranean eating pattern, built around vegetables, fruit, legumes, whole grains, olive oil, nuts and fish, has been linked to slower cognitive decline and a reduced risk of Alzheimer’s disease. Researchers believe the combination of healthy fats, antioxidants and fibre may help regulate inflammation and protect blood vessels supplying the brain.
Omega-3 fatty acids, found in oily fish such as sardines and salmon, are particularly important for maintaining the structure of nerve cells. Meanwhile, plant compounds found in berries, olive oil, vegetables and other foods are being investigated for their potential to protect cells from damage associated with ageing.
There is also growing evidence that nutritional deficiencies can affect memory and concentration. Vitamin B12, for instance, is essential for normal nerve function, and a deficiency can cause neurological symptoms, including cognitive difficulties. Folate, vitamin D and magnesium also play important roles in brain function, although the evidence does not establish that taking additional supplements prevents dementia in people without a deficiency.
The distinction is important. Researchers are not advocating a particular superfood or vitamin regimen. Rather, the evidence increasingly favours the nutritional benefits of a balanced diet maintained over many years.
What happens outside the kitchen may be just as significant.
The review highlights research linking prolonged exposure to air pollution with an increased risk of cognitive decline and neurodegenerative disease. Fine particulate matter, commonly produced by vehicle exhausts, industrial activity and other combustion sources, is of particular concern because it can contribute to inflammation and damage to the body’s vascular system.
Some studies have associated long-term exposure to these particles with a higher incidence of Alzheimer’s disease and Parkinson’s disease. Researchers are also examining how certain pesticides and heavy metals, including lead and mercury, can interfere with normal neurological function.
These findings raise questions about the environments in which people live and work. Unlike decisions about exercise or food, exposure to polluted air and industrial chemicals is not always within an individual’s control. The review therefore emphasises the importance of environmental regulation and public health policies alongside personal prevention strategies.
Sleep is another area attracting increasing scientific attention. During sleep, the brain performs essential functions involved in memory, learning and cellular maintenance. Persistent sleep disturbance has been associated with poorer cognitive performance and a higher risk of dementia, although the relationship is complicated. Changes associated with developing neurological disease can themselves interfere with sleep, making cause and effect difficult to separate.
Physical activity offers more encouraging evidence. Regular movement improves circulation, helps regulate blood pressure and blood sugar, and supports the brain’s ability to maintain and adapt its neural connections. Studies have associated consistent physical activity with better cognitive function and a lower risk of several neurological conditions.
The benefits do not appear to depend on extreme exercise. Walking, swimming, cycling and strength training can all contribute to better cardiovascular health, which is closely connected to the health of the brain.
The broader findings are consistent with a major 2024 report from The Lancet Commission on dementia prevention, which identified 14 potentially modifiable risk factors, including physical inactivity, high cholesterol, high blood pressure, smoking, hearing loss, social isolation and air pollution.
The commission estimated that addressing these factors could potentially prevent or delay approximately 45 per cent of dementia cases worldwide. This is a population-level estimate rather than a prediction of any one person’s risk, but it illustrates how significant prevention could become.
There are important limits to what the latest research can tell us. The University of Bern publication is a review of existing scientific evidence, not a new clinical trial, and many of the studies it examines establish associations rather than proving direct causes. The findings also vary between conditions. What helps reduce the risk of dementia may not necessarily prevent Parkinson’s disease or alter the progression of an existing neurological disorder.
Nevertheless, the practical implications are becoming clearer. Maintaining a healthy blood pressure, eating a varied diet, exercising regularly, getting sufficient sleep and avoiding tobacco are not simply recommendations for protecting the heart or maintaining a healthy weight. They may also contribute to preserving cognitive function as we age.
For people already living with neurological disease, these measures may support general health and wellbeing, but they are not substitutes for established medical treatments.
Perhaps the most significant message is that the foundations of brain health are laid long before problems with memory or concentration become apparent. Research increasingly points towards the cumulative influence of habits and environmental conditions across decades, rather than a single decision made later in life.
The prospect of preventing every neurological disorder remains beyond the reach of current science. What is becoming clearer, however, is that looking after the brain involves many of the same ordinary decisions that shape our health throughout life.
Source: Chakif, D. and Furrer, J. (2026). The Impact of Nutritional, Environmental, and Lifestyle Factors on Neurological Disorders: Therapeutic Implications and Mechanistic Insights. Frontiers in Pharmacology. DOI: 10.3389/fphar.2026.1765786.
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