Parkinson's Disease as a Potential Stuck Program Mode of the Candida albicans Biochemical Computer

Parkinson's disease (PD) is a progressive neurodegenerative disorder characterized by loss of dopaminergic neurons in the substantia nigra, producing motor symptoms (tremor, rigidity, bradykinesia) and non-motor symptoms (constipation, depression, cognitive decline, anosmia) that often precede motor onset by decades. The non-motor prodrome, particularly the gastrointestinal symptoms, has led to increasing interest in the gut-brain axis as a contributor to PD pathogenesis. This paper applies the biochemical computer framework (Craddock, 2026a; 2026b) to propose, speculatively, that PD may represent a stuck program mode in which the commensal fungal symbiont Candida albicans drives sustained dopaminergic interface engagement and neurotoxic kynurenine pathway metabolite production, resulting in progressive burnout of substantia nigra neurons. A program refined for Homo Candidus with a likely limited duration, but in this case stuck without an exit due to version conflict. This candidate is explicitly presented as a speculative extension of the framework. The mechanistic chain requires more intermediary steps than the other conditions in this series, and the clustering evidence is the weakest of any candidate. The paper is included to demonstrate the framework's range, to generate testable hypotheses, and to identify the specific evidentiary gaps that would need to be filled to strengthen or reject the proposal.