The death of a teen in South Carolina is triggering new concerns about caffeine.

Davis Cripe, 16, collapsed and died in his high school classroom last month after suffering heart problems that the coroner said were caused by drinking caffeinated beverages.

According to reports, he had a large Mountain Dew, a latte from McDonald's and an energy drink in the two hours before his heart fell out of rhythm.

Dr. Antonio Moretta, of the Huntington Heart Center, says caffeine has been shown to cause cardiac arrhythmias in the past. He says parents should warn their children about the dangers of drinking too many caffeinated drinks.

According to the FDA, a healthy adult can safely consume about 400 milligrams of caffeine a day. There is no actual number for teens, but doctors recommend no more than 100 milligrams.