Because the cause of Parkinson' s is unknown, definitive ways to prevent the disease also remain a mystery. However, some research has shown that caffeine-which is found in coffee, tea and cola---may reduce the risk of developing Parkinson,'s disease. Greentea also may reduce the risk of developing Parkinson's diseaseBecause the cause of Parkinson's is unknown, definitive ways to prevent the disease also remain a mystery. However, some research has shown that caffeine —which is found in coffee, tea and cola —may reduce the risk of developing Parkinson's disease. Green tea also may reduce the risk of developing Parkinson's disease