MAPT and early-onset autosomal dominant Alzheimer disease: In the field of neurodegenerative diseases, DHA delays the progression of Alzheimer’s disease by inhibiting Aβ deposition, reducing tau protein phosphorylation, and enhancing synaptic plasticity; omega-6 unsaturated fatty acid metabolites (such as EET) may improve Parkinson’s disease symptoms through antioxidant and anti-inflammatory effects.