Neurotoxicity of heavy metals across the lifespan: The beneficial role of nutrition from fetus to the elderly

Heavy metals pose a profound threat to neurological health across all stages of human life, from prenatal development to old age. Heavy metals such as lead, mercury, cadmium, and arsenic are pervasive environmental pollutants that disrupt neural function through mechanisms including oxidative stress, inflammation, mitochondrial dysfunction, and neurotransmitter system imbalances. During critical developmental windows such as fetal growth and early childhood, exposure can impair neurogenesis, synaptic plasticity, and myelination, leading to lifelong cognitive deficits, behavioral disorders, and increased vulnerability to neurodegenerative diseases in later life. Even in adulthood and aging, chronic exposure exacerbates neurodegeneration, accelerating conditions like Alzheimer's and Parkinson's diseases through persistent oxidative damage and inflammatory cascades. This chapter underscores the dual role of nutrition as both a shield and a therapeutic tool against heavy metal neurotoxicity. Key nutrients, such as polyphenols, vitamins, and essential minerals, counteract heavy metal-induced damage by scavenging free radicals, enhancing antioxidant defenses, modulating inflammation, and promoting neuronal repair. By integrating evidence from epidemiological, preclinical, and clinical studies, this chapter emphasizes actionable strategies, such as fortified infant formulas, plant-based proteins, and micronutrient supplementation to reduce heavy metal bioavailability and bolster neurological resilience. Public health initiatives targeting vulnerable populations, alongside policies regulating environmental pollutants, are critical to curbing this silent epidemic. This chapter advocates for a proactive, nutrition-centered approach to safeguarding brain health, demonstrating that dietary interventions are not merely complementary but foundational in combating the pervasive threat of heavy metal neurotoxicity across generations.