>The research also showed that moderate and heavy coffee drinkers were most likely to be male, smoke and consume alcohol regularly. So this shows an obvious pr

>The research also showed that moderate and heavy coffee drinkers were most likely to be male, smoke and consume alcohol regularly. So this shows an obvious problem with the study. They did not rule out co-factors. If the moderate to heavy coffee drinkers are also smoke and consume alcohol regularly, then this already puts them at a higher risk for heart disease, and likely completely dwarfs any effect of caffeine.