A study suggests that military members who take caffeine supplements may be consuming too much of a good thing. Those servicemembers probably consume caffeine in other ways such as coffee, researchers say.(Photo: H. Darr Beiser, USA TODAY)
Troops who take dietary supplements to lose weight or get ripped may be getting more caffeine than is healthy, according to a new study published online Monday at JAMA Internal Medicine.
Chemical
analysis of 31 popular supplements sold on military bases that contain
caffeine showed that fewer than half accurately listed caffeine content,
with some products containing more caffeine than five 12-ounce Mountain
Dews.
Although the study did not name the products tested, the
research is important, author Dr. Pieter Cohen said, because
servicemembers who use supplements probably also consume caffeine from
coffee, energy drinks and food and may be getting too much of a good
thing.
"Caffeine is extremely safe in the amounts found in food,
and research has showed with low to moderate doses, your performance -
increased vigilance and decreased reaction time - is better. But like
any drug or medication, get too much of it, and the benefits decrease.
At high doses, you are going to have side effects," Cohen said.
Cohen, an assistant professor at Harvard University and internist at Cambridge, Mass.-based Cambridge Health Alliance, teamed with other researchers, including Patricia Deuster with the Uniformed Services University Consortium for Health and Military Performance, on the research.
The
group looked at the caffeine content of the 31 top-selling supplements
sold at installation exchanges that either listed caffeine as an
ingredient or probably contained it, based on other ingredients on
their labels.
Most were weight-loss or workout enhancement supplements, and one was marketed as a multivitamin, Cohen said.
Of
the 20 products that listed caffeine on their labels, nine contained
accurate amounts, according to the researchers, although "accurate"
meant within 10% of the listed amount.
In one case, this meant the
product, with a label noting it contained 400 mg of caffeine - 11 times
the amount in a 12-ounce Coke - actually contained 435 mg of caffeine,
or the amount found in 12 Cokes.
Five of the products contained far less (27%) or more (113%) caffeine than stated.
And
six listed caffeine on their labels without any amount noted, as is
allowed under Food and Drug Administration regulations. Those six all
contained "high amounts of caffeine ranging from 210 to 310 mg per
serving," according to the study.
"This is all legal and
legitimate from a regulatory standpoint, but from a consumer standpoint,
it's not helpful. The quantity of caffeine should be clearly stated on a
label and needs to be accurate," Cohen said.
In December, FDA
officials said they were reviewing the safety of energy drinks
containing caffeine and other stimulants to include an investigation of
adverse reactions to energy drinks and shots as well as consultations
with outside experts, according to the office of Sen. Richard
Blumenthal, D-Conn.
In November, the FDA confirmed it had received
reports of 13 deaths and 92 medical events associated with people who
had taken the popular shot 5-hour Energy.
In October, the FDA also said it was investigating reports of five deaths among those who consumed Monster Energy drinks.
The
reports of adverse health problems after consumption of these energy
drinks does not imply that the drinks caused the problems or even
contributed to them, however. It means only that consumers, physicians,
medical facilities or the company itself notified FDA of a medical
problem that occurred either during or after consuming the products.
Cohen said he looked at dietary supplements because he believes they are an overlooked source of caffeine for servicemembers.
He
advised troops to consume caffeine from only well-labeled sources,
such as caffeine pills, gum and sodas, all of which are regulated by the
FDA.
"We don't want to throw caffeine under the bus. Caffeine is a
safe, fantastic ingredient. ... I would avoid supplements that list
caffeine in any amount on their labels. Combining them with energy
drinks or any other caffeinated product could be detrimental to your
health," he said.
Patricia Kime, Military Times