WEDNESDAY, Jan. 16 (HealthDay News) -- As the popularity of energy drinks has soared, so has the number of Americans seeking treatment in hospital emergency rooms after consuming these highly caffeinated beverages, federal health officials report.
Between 2007 and 2011, the number of ER visits more than doubled from roughly 10,000 to almost 21,000. In 2011, 58 percent of these ER visits involved energy drinks alone, while 42 percent also included drug or alcohol use.
Most of these cases involved teens or young adults, although there was an alarming spike in the number of people aged 40 and older showing up in the ER after consuming these drinks, according to the report from the U.S. Substance Abuse and Mental Health Services Administration. Symptoms ranged from insomnia, nervousness, headaches and fast heartbeats to seizures.
Energy drinks contain high amounts of caffeine that can stimulate both the central nervous system and cardiovascular system, experts note. Caffeine levels in energy drinks range from about 80 milligrams (mg) to more than 500 mg in a can or bottle, the report noted, while a 5-ounce cup of coffee contains 100 mg of caffeine and a 12-ounce soda contains 50 mg of caffeine, the report said.
The beverages can also have other ingredients that may boost the stimulant effects of caffeine, according to report.
Many doctors are concerned about the high levels of caffeine in energy drinks, which can cause a major increase in heart rate and drive up blood pressure, explained Dr. Suzanne Steinbaum, a preventive cardiologist at Lenox Hill Hospital in New York City.
"In anyone who has any underlying heart condition, these two effects can be deadly," she told HealthDay recently. "Know what you're drinking before you drink it."
Dr. Mary Claire O'Brien, a leading expert on energy drinks from Wake Forest Baptist Medical Center in Winston Salem, N.C., had this this to say about the findin
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