a higher risk of miscarriage and delivery of a low birth weight infant if your caffeine intake exceeds 200 to 300 milligrams per day.
Addictive Properties
Caffeine dependence can occur, according to a 1994 study published in The Journal of the American Medical Association. In the study, researchers determined that caffeine drinkers who had an average of 357 milligrams of caffeine per day showed classic drug dependence signs and symptoms such as a higher tolerance for caffeine with frequent use, a persistent desire or unsuccessful attempt at limiting their intake, withdrawal symptoms when they cut back on their intake and choosing to continue consuming caffeine in spite of the knowledge that caffeine might cause them psychological and physical problems. Common caffeine withdrawal symptoms -- headache, fatigue, irritability, trouble concentrating and depression -- have been observed at persistent intakes as low as 100 milligrams per day, but they are more common with higher consumption levels, according to the Linus Pauling Institute.