According to research examining the long-term effect of coffee drinking on the risk of diabetes, coffee drinkers – especially those who drink over four cups a day – are at an increased risk of heart attacks and other cardiovascular events. Heavy coffee consumption can also trigger pre-diabetes in young adults with hypertension, the study said. The 12-year research involving more than 1,200 patients (age 18-45) found that heavy coffee drinkers had a four-fold increased cardiovascular risk while moderate drinkers had tripled risk. The study included non-diabetic patients who had untreated stage 1 hypertension (systolic blood pressure between 140 and 159 mmHg and/or diastolic blood pressure between 90 and 99 mmHg). — The findings were presented at the ESC Congress – the annual congress of the European Society of Cardiology (ESC) – in London on August 29, 2015.