The difficulty in getting to the bottom of whether or not coffee and caffeine are good for you comes from our one-size-fits-all mentality that many scientific studies are based on. Women clearly have more issues with caffeine than most men. As we age, our bodies change so what was fine in your twenties becomes problematic in your forties. So many studies use healthy young adults or only men. Or they exclude classes of individuals that have conditions that might make them more susceptible to caffeine. Since many studies are funded by organizations set on proving caffeine is good for everyone, studies can be skewed to favor positive outcomes.