There is a good deal of debate about the health effects of caffeine, and whether these effects are primarily positive or negative. Caffeine, particularly in coffee, has been studied closely to determine where it may be of benefit, and where it may cause undesirable effects. Health benefits of caffeine Parkinson's disease Parkinson's is caused by the loss of brain cells that produce a chemical messenger called dopamine. According to a researcher from the Harvard School of Public Health in Boston, people who drink coffee or consume caffeine regularly have a lower risk of developing Parkinson's disease. The research put forth...