Three to five cups of coffee a day may lower the risk of dying prematurely from some illnesses than those who do not drink or drink less coffee new research suggests. The researchers from Harvard University s T.H. Chan School of Public Health found that drinkers of both caffeinated and decaffeinated coffee saw benefits including a lower risk of death from cardiovascular disease neurological diseases Type 2 diabetes and suicide. Bioactive compounds in coffee reduce insulin resistance and systematic inflammation said first author and doctoral student Ming Ding. Researchers analysed health data gathered from participants in three large ongoing studies.