Caffeine may affect teenage girls and boys differently.
In a new study, researchers at the University at Buffalo found caffeine affected boys and girls the same. But as they entered puberty, young women had different heart rate and blood pressure reactions to the stimulant than young men.
They also found the young women experienced different reactions during their menstrual cycle, which makes researchers think a hormonal factor may be at play.
However, outside experts say the findings are far from clear and more research is needed.