People who drink several large mugs of tea a day may more than halve their risk of developing Parkinson’s disease according to new studies from the National University in Singapore and Jiwaji University in India which looked at he tea drinking habits of thousands of people and compared drinking levels of those who went on to develop Parkinson’s and those who did not. Researchers say extracts in black tea may slow down the disease progression as well as delaying the start of the degenerative process.