Parkinson's Disease
Up until recent times, this illness has been described exclusively as an illness of the brain. It was 1960 when it was first known that the Basal Ganglia of the brain was not functioning normally in Parkinson's Disease. It was found that Dopamine, which is produced by cells in that area, was deficient. We now know that there is injury to the cellular mechanism producing Dopamine when the cells are injured or destroyed.
  Medicines were produced to help stop the symptoms of the illness, but nothing was done about the process which continues to worsen. Recently, evidence has become available showing how the liver of Parkinson's patients doesn't work efficiently, and thus chemicals and free radical metabolites from the faulty detoxification process can damage areas of the body. In the case of this illness it is the basal ganglia cells.  Various studies have identified an increased incidence of this illness in populations having higher exposure to environmental toxins (herbicides, pesticides, chemicals, etc.) In areas where pesticides are used on farms (compared to areas where they are not) Parkinson's is found to be 7-10 times more common.
  The reason not everyone develops Parkinson's Disease with similar exposure has to do with the genetic and nutritional causes of abnormal liver detoxication in some and not in others.  There is another finding of interest lately in this disease. There is an increased level of iron in the areas of injury in this illness. It is not known why certain parts of the brain accumulate iron, but where there is excess iron there is more free radical injury to the cells.
Typically, a number of laboratory studies are employed, including:
Nutritional biochemistry
Liver detoxication
Toxicology
Gastrointestinal
After all the information is accumulated, a plan for therapeutic intervention is developed which will include:
Improved liver detoxication with nutritional intervention
Antioxidant therapy
Detoxification of chemicals from the body with:
Sauna depuration
Colon cleansing
Lymphatic drainage
Intravenous nutritional detoxification therapy
Improved liver detoxification (enemas)
Detoxification of metals including iron using chelation therapy
It is most likely not possible to reverse the damage that has been done to the brain, but if the process can be stopped a major accomplishment will have occurred. Prevention is the only way to avoid developing this illness.