The way your body metabolises your cup of coffee each morning may determine your chances of developing Parkinson's disease according to a study. The findings showed that people with Parkinson's disease had significantly lower levels of caffeine in their blood than people without the disease even if they consumed the same amount of caffeine. Thus testing the level of caffeine in the blood may provide a simple way to aid the diagnosis of Parkinson's disease the researchers said. Also read about early signs of Parkinson s disease. Previous studies have shown a link between caffeine and a lower risk of