A Johns Hopkins researcher says that young people can overdose on caffeinated energy drinks and is calling for mandatory health warnings for such drinks similar to those required for caffeine pills, The Guardian reported Sept. 24.

Warning labels should describe the risks associated with excessive caffeine use, such as anxiety attacks, rapid heartbeat and nausea, said Roland Griffiths, a researcher at Johns Hopkins University. Griffiths recently surveyed caffeine levels in various energy drinks available in the U.S. and found that some had 14 times the caffeine normally found in a can of soda.

Griffiths said young people may be more sensitive to caffeine because they don't drink as much tea and coffee as adults.

The study was published online in the journal Drug and Alcohol Dependence.