No More Than 2-3 Cups Per Day…

Using current research on the over-consumption of caffeine as a guide, Dr. Laura Juliano, co-author of “Caffeine Use Disorder: A Comprehensive Review and Research Agenda,” recommends healthy adults limit caffeine consumption to no more than two to three cups of coffee per day (about 400 mg/day) and pregnant women to no more than half that amount. She also recommends people with health problems such as anxiety, insomnia, heart problems, or urinary incontinence limit or even eliminate caffeine consumption.
Journal of Caffeine Research, February 2014