I love all these health surveys and certainly they often tend to contradict each other, but they do reveal some interesting facts.  Researchers followed 200,000 nurses and doctors up to 30 years on their coffee habit, amongst other habits, and they have discovered that more coffee that people drink, the more their risk of dying of heart disease, stroke, diabetes and suicide was reduced.  They said they could not find the association though in smokers because the negatives of smoking overwhelm any of the benefits from drinking coffee, but those for example who had three to five cups of coffee a day had a 15% reduced risk of death from heart disease.  I find that caffeine unfortunately triggers me off if I get correspondence or e-mails that I don’t like but if I have coffee while I am on holiday, it does not affect me at all.  It is obviously because coffee contains caffeine and it stimulates your adrenal glands to produce adrenalin.  Coffee is a stimulant and there is no doubt that it can get some people quite worked up, not to mention increasing your blood pressure. Like everything, it is a question of what you can handle and using in moderation!