Though several studies have shown that coffee may actually be good for you, new research shows that too much java may be bad for some coffee lovers’ hearts.For a nation fueled by Starbucks, studies suggesting that coffee drinkers may be at decreased risk for several major diseases, including Parkinson’s and diabetes, is welcome news.WebMD even recently reported on two studies from The Journal of the National Cancer Institute showing that coffee may significantly lower the risk of colon and liver cancers.But there is also evidence that coffee may increase the risk of heart disease for some, and a new study from Greece seems to bolster the claim. Researchers from the University of Athens found that coffee drinkers had more stiffness of the major blood vessel of the body than non-coffee drinkers. Decreased elasticity of major blood vessels is a risk factor for developing heart disease like heart attack and stroke.The findings are reported in the June 1 issue of the American Journal of Clinical Nutrition.