Based on the unified G₀ and ΔGd cellular theoretical system constructed in SFL-CELL-01 to SFL-04, this paper systematically explains the core pathogenesis of two typical age-related neurodegenerative disorders: Parkinson’s disease and Alzheimer’s disease. All central nerve cells are endowed with fixed, integrated G₀ architecture equipped with independent functional modules for protein synthesis, clearance and metabolic balance. Abnormal protein aggregation is not the primary cause of nerve cell aging and dysfunction, but a secondary outcome triggered by sustained irreversible ΔGd(-) damage to the protein homeostasis regulatory segment of native G₀ framework. Universal state equation applied uniformly across all SFL serials G = G₀ + ΔGd(+) − ΔGd(−) Trivial physiological wear denoted as ΔGd(+) can be eliminated through routine intracellular metabolic circulation without disrupting normal protein clearance efficiency. Persistent inflammatory stimulation, long-term toxin exposure and chronic oxidative stress continuously stack permanent ΔGd(-) structural loss, which weakens or even disables the protein degradation and purification modules within neuronal G₀. Unremoved misfolded proteins progressively deposit inside brain tissue, interfering with nerve signal transmission and accelerating the continuous collapse of other auxiliary G₀ functional units, ultimately generating typical clinical manifestations including memory loss, movement tremor and cognitive decline. Traditional therapeutic schemes merely dissolve accumulated abnormal proteins to ease superficial symptoms; the fundamental intervention goal is to slow ΔGd(-) accumulation and maintain the complete protein homeostasis G₀ module of neurons. This degenerative mechanism shares the same core damage logic as SLE, malignant lesions and ALS recorded in previous papers, forming a unified cellular pathological interpretation of degenerative nervous system diseases, and its long-term whole-body aging consumption can be quantified by the lifespan mathematical model in the follow-up SFL-LS series.
FOO SENG ANG (Sat,) studied this question.