Consumption of coffee helps relieve symptoms of Parkinson's disease. 

A study of more than 60 people found that users of caffeine supplements showed an improvement in tremor at rest, characteristic of the disease.
The improvement is slight, but may be enough to benefit Parkinson's disease sufferers, explains Professor Ronald Postuma of McGill University in Montreal.
Caffeine helps control movement, but not against the feeling of drowsiness among those affected by Parkinson's, the research team also found. 
Parkinson's disease is a slowly progressive disease. It is manifested by tremor at rest, slowness of volitional movements and increased muscle tone. The reasons for the development of the disease are still unclear.
Other studies have also analyzed the effects of caffeine in calming the symptoms of neurodegenerative disease. Three years ago, researchers reported that people who drank two cups of coffee a day were 25 percent less likely to develop Parkinson's. The results of such a study showed that the drink can prevent the development of Alzheimer's disease.
Participants in the present study suffered from Parkinson's disease and complained of daytime drowsiness and symptoms of tremor. Volunteers used placebo or tablets containing 100 mg of caffeine twice a day for three weeks, then the dose was increased to 200 mg twice a day for the same period. This equates to two to three cups of coffee, the researchers said.
After six weeks, half of the participants taking caffeine supplements showed an improvement in speed and a feeling of stiffness compared with placebo. However, the ingredient has no effect on relieving the symptoms of fatigue, scientists emphasize.
The study is covered in the journal Neurology .