Systemic interventions reverse early dementia by addressing nutritional, infectious and environmental root causes—beyond individualised care

Indigenous knowledge systems have long recognised the link between diet, environment, and cognitive health, with practices like the Mediterranean diet (rooted in Indigenous Levantine traditions) and traditional fermented foods (e.g., kimchi, miso) demonstrating protective effects against neurodegeneration. However, these systems are systematically devalued in favour of Western biomedical models, which pathologise Indigenous lifeways while profiting from synthetic treatments. The erasure of Indigenous perspectives also ignores how colonial land dispossession disrupted traditional food systems, contributing to the nutritional deficiencies now linked to dementia.

Historical records show that nutritional interventions have reversed cognitive decline in populations facing famine or wartime deprivation, such as post-WWII Europe where improved diets correlated with reduced dementia rates. The 19th-century work of physician William Osler linked cognitive decline to chronic infections like syphilis, a precursor to modern findings on the role of *Borrelia* and other pathogens in neurodegeneration. However, the medical establishment has repeatedly oscillated between blaming individual lifestyle or infectious agents, obscuring the deeper structural drivers—industrialisation, urbanisation, and environmental degradation—that create the conditions for both.

Cross-cultural comparisons reveal that societies with diets rich in whole foods, low in processed ingredients, and high in community social structures (e.g., Okinawan elders, Mediterranean populations) exhibit lower rates of dementia, suggesting cultural practices are protective. In contrast, Indigenous Arctic communities experiencing rapid dietary transitions due to climate change and industrial contamination report rising cognitive decline, highlighting the role of environmental toxins in neurodegeneration. Yet Western medicine often dismisses these patterns as 'anecdotal,' preferring randomised controlled trials that isolate variables rather than studying holistic, culturally embedded health practices.

The study’s findings align with emerging scientific consensus that 40% of dementia cases are attributable to modifiable risk factors, including air pollution (PM2.5 exposure increases risk by 7% per 2 µg/m³), untreated infections (e.g., *Helicobacter pylori*, herpes simplex virus), and nutritional deficiencies (e.g., vitamin B12, omega-3s). However, mainstream science often frames these as 'lifestyle choices' rather than products of systemic inequities, such as food deserts or industrial zoning that concentrates pollution in low-income neighbourhoods. The focus on bespoke plans also overlooks the limitations of reductionist biomarkers in diagnosing dementia, which may miss early-stage cases linked to environmental exposures.

Artistic and spiritual traditions frequently depict dementia as a loss of connection—to self, community, or the natural world—rather than a purely biological malfunction, suggesting that healing requires reintegration. In many Indigenous cultures, elders with cognitive decline are revered as repositories of wisdom, their 'forgetfulness' seen as a transition to ancestral knowledge rather than a pathology. Western art, however, often portrays dementia through dystopian lenses (e.g., *Still Alice*), reinforcing stigma and individualising suffering, while ignoring the role of environmental alienation in cognitive decline.

Future modelling suggests that without systemic interventions, dementia rates will surge by 150% by 2050, driven by climate change (heat stress, air pollution), ultra-processed food proliferation, and antibiotic-resistant infections. Scenario planning indicates that policies addressing food system reform (e.g., banning glyphosate, mandating whole-food diets in schools) could reduce dementia prevalence by 30% within a generation, while community-based neuroprotective programs (e.g., urban green spaces, infection control) offer scalable solutions. However, current trends prioritise high-cost pharmaceuticals over preventive public health, risking a bifurcated future where only the wealthy access cognitive longevity.

Marginalised communities—Black Americans (2x higher dementia risk due to systemic racism), Indigenous populations (exposed to heavy metals from mining), and low-income groups (living near industrial zones)—are disproportionately affected by the root causes of cognitive decline but are excluded from both research and solution design. Their lived experiences, such as the high prevalence of dementia in Black communities linked to historical redlining and healthcare discrimination, are rarely centred in biomedical discourse. Even when interventions like nutritional programs are implemented, they often fail to account for cultural preferences or the trauma of food insecurity, rendering them ineffective.