ZX pisze:

Nie ma miejsca na miejskie legendy a gadacie jak narkusy zafajdane.

https://en.wikipedia.org/wiki/Manganism

The current mainstay of manganism treatment is levodopa and chelation with EDTA. Both have limited and at best transient efficacy. Replenishing the deficit of dopamine with levodopa has been shown to initially improve extrapyramidal symptoms,[27][28][29] but the response to treatment goes down after 2 or 3 years,[30] with worsening condition of the same patients noted even after 10 years since last exposure to manganese.[31] Enhanced excretion of manganese prompted by chelation therapy brings its blood levels down but the symptoms remain largely unchanged, raising questions about efficacy of this form of treatment.[32][33]

I po 10 latach nie pogarsza się trochę tylko kilkukrotnie i nigdy już się nie cofa. Proces zaczyna się po 2-3 latach. W źródłach na wikipedii jest link do tego badania, gdzie jest dokładnie podana skala poziomu parkinsonizmu, z tego co pamiętam to było nie mniej niż dwukrotne pogorszenie.

https://n.neurology.org/content/50/3/698

The mean scores of the King's College Hospital Rating Scale for Parkinson's disease increased from 15.0 ± 4.2 in 1987 to 28.3 ± 6.70 in 1991 and then to 38.1 ± 12.9 in 1995. The deterioration was most prominent in gait, rigidity, speed of foot tapping, and writing. Tissue concentrations of manganese in blood, urine, scalp hair, and pubic hair returned to normal.

Z 15 kurwa na 38 w 8 lat.

https://www.ncbi.nlm.nih.gov/m/pubmed/17052946/

We investigated the clinical features and progression of four patients with chronic manganese intoxication, 18 years after cessation of exposure. Because the results were to be compared with previous observations, we employed the same scoring system. The clinical manifestations were foot dystonia, wide based gait, rigidity, and difficulty in walking backwards. Resting tremor was rarely seen, but tongue tremor was found in 2 patients. The asymmetry initially present in 2 patients persisted 18 years later. Measurements had previously revealed rapid progression in the initial 10 years. We found a plateau over the following decade.

Czyli sie pogarsza przez 10 lat szybko a potem przez 10 lat zwalnia ale dalej sie pogarsza.