Nutritional and Environmental Influences on Multiple Sclerosis

Multiple sclerosis (MS) is a chronic neuroinflammatory disorder characterised by immune-mediated damage to myelin sheaths in the central nervous system. Although genetic predisposition underpins susceptibility, a broad range of nutritional and environmental factors modulate both risk of onset and rate of progression. Dietary components such as essential fatty acids, vitamins (notably B12 and D), trace elements and antioxidants influence inflammatory pathways, neuronal resilience and repair. Conversely, exposures to heavy metals, organic solvents, air pollutants and microbial toxins may provoke oxidative stress, disrupt the blood–brain barrier and exacerbate demyelination. Geographical factors including ultraviolet-B exposure, smoking prevalence and soil composition further shape regional incidence patterns. Nutritional deficiencies have been linked to poorer cognitive outcomes and greater disability, while targeted dietary interventions show promise in ameliorating symptoms and slowing neurodegeneration. A deeper understanding of the mechanisms by which nutrients and environmental agents interact with immune and glial cells is guiding the development of personalised management strategies to reduce disease burden worldwide.

Research from Nature Portfolio

Recent investigations into the distribution of potentially toxic elements in post-mortem MS brain tissue reveal that combinations of iron, aluminium, lead, mercury and other metals accumulate preferentially within locus coeruleus neurons and adjacent white matter tracts. Advanced imaging techniques demonstrated these metals within oligodendrocytes, astrocytes and endothelial cells, suggesting that metal-induced weakening of the blood–brain barrier permits further infiltration of toxicants. The study proposes a synergistic model in which metal deposition initiates local oxidative damage, promotes demyelination and impairs remyelination, thereby offering novel insights into environmental contributions to disease pathology.

Nutritional and Environmental Influences on Multiple Sclerosis publication trend

The graph below shows the total number of articles in nutritional and environmental influences on multiple sclerosis across all publications each year (not limited to Nature Index journals).

Technical terms

Demyelination: Loss or damage of the myelin sheath insulating nerve fibres, leading to impaired signal conduction.

Oligodendrocyte: Glial cell responsible for the formation and maintenance of myelin in the central nervous system.

Blood–brain barrier (BBB): Selective endothelial interface that regulates passage of substances from the bloodstream into the brain.

Antioxidant capacity: The ability of cells or fluids to neutralise reactive oxygen species and prevent oxidative damage.

Biomarker: Measurable indicator of a biological condition or process, used for diagnosis or monitoring of disease.

References

1. The Beneficial and Debilitating Effects of Environmental and Microbial Toxins, Drugs, Organic Solvents and Heavy Metals on the Onset and Progression of Multiple Sclerosis. Toxins (2019).
2. Multiple Sclerosis Incidence Associated with the Soil Lead and Arsenic Concentrations in Taiwan. PLOS ONE (2013).
3. Potentially toxic elements in the brains of people with multiple sclerosis. Scientific Reports (2023).
4. The Blood Concentration of Metallic Nanoparticles Is Related to Cognitive Performance in People with Multiple Sclerosis: An Exploratory Analysis. Biomedicines (2023).
5. Serum levels of Homocysteine, Vitamin B12 and Folate in Patients with Multiple Sclerosis: an Updated Meta-Analysis. International Journal of Medical Sciences (2020).
6. New Insights on the Nutrition Status and Antioxidant Capacity in Multiple Sclerosis Patients. Nutrients (2019).