While a moderate amount of coffee has been found to be beneficial—credited with everything from preventing depression to boosting weight loss—new research indicates that too much coffee can increase the risk of early death in young people. In fact, researchers found that drinking more than four cups of coffee a day increased the risk of premature death by 21 percent. If you're under the age of 55, that increased risk jumps to 50 percent.
The study notes that a cup of coffee is 6 to 8 ounces. Most Americans drink about three of those a day.
"From our study, it seems safe to drink one to three cups of coffee a day," said study co-author Xuemei Sui, assistant professor of exercise science with the Arnold School of Public Health at the University of South Carolina in Columbia. "But more than four cups of coffee a day may endanger health."