There was a linear relationship between coffee use and risk of hypertension needing treatment, with a 100% increased risk of pre-diabetes in the heavy drinkers.

Lucio Mos of the Hospital of San Daniele del Friuli said, "Drinking coffee increased the risk of pre-diabetes in young adults with hypertension who were slow caffeine metabolizers. The risk was even greater in the case of overweight or obese. Our study showed that coffee use was linearly associated with increased risk of cardiovascular events in young adults with mild hypertension. These patients should be aware that coffee consumption might increase their risk of developing more severe hypertension and diabetes in later life and should keep consumption to a minimum."
Source-ANI