1 OPINION. 2  The screening process for Syrian refugees is much more rigorous than for other visitors coming to the U.S. (AP Photo/Hassan Ammar)
About 250 milligrams of caffeine â or the equivalent of 2 to 2 1/2 cups (473 to 591 milliliters) of plain, brewed coffee â a day may cause this effect. If you have type 2 diabetes and you're struggling to control your blood sugar levels, limiting the amount of caffeine in your diet may provide a benefit.
Caffeine dosage is considering as low if it is 130 to 300 mg/day, moderate if 200 to 300 mg/day, high if more than 400 mg/day, and heavy if more than 6,000 mg/day. Caffeine can cause a short-term dramatic rise in your blood pressure.