There are certain studies that coffee lovers, well, love. This is one of them: Drinking several cups of caffeinated coffee or tea a day may protect against Type 2 diabetes, coronary heart disease and stroke. Provided they don’t drink too much, that is. ↧ Drinking this much coffee a day is linked to a lower risk of severa... People who consumed 200 to 300 milligrams of caffeine a day were less likely to develop coronary heart disease, Type 2 diabetes or stroke.