Teenagers should have no more than 100 milligrams of caffeine a day - that's the equivalent of one cup of coffee.
But many are getting much more and the parents of 16-year-old Davis Cripe of South Carolina think it's time to do something.
Cripe died last April after drinking a Mountain Dew soda, a latte, and an energy drink within 2 hours.
The coroner says the caffeine overload probably disrupted his heart rhythm and stopped his heart.
Cripe's parents are now backing a proposed bill in South Carolina. It would make it illegal to sell or give energy drinks to teenagers.
Energy drinks contain up to 300 milligrams of caffeine - adults should only have about 400 milligrams per day.
Federal guidelines ban the sales of energy drinks at schools.
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