Or so says a study reported in New Scientist:
Ronald Postuma of McGill University in Montreal, Canada, and colleagues gave 61 people with Parkinson’s a 6-week course of pills containing the caffeine equivalent of about three cups of coffee every day, or a placebo.
Only people in the caffeine group showed a significant improvement in tests for motor problems, such as the severity of their tremors, and general mobility (Neurology, DOI: 10.1212/WNL.0b013e318263570d).
I wonder how big their cups are, and how strong their coffee is?
I further wonder whether s result is in any way related to the observations about chocolate.
Apparently, this is due to the fact that caffeine blocks adenosine receptors in the brain, and that adenosine receptors “normally inhibit the production of dopamine”.