Some papers and research have linked energy drink consumption to an increased risk for symptoms of mental health problems.
However, a review paper published in the Journal of Caffeine Research last year suggests that there is not enough evidence to determine causation or direction of effect.
“The blood vessels in the heart during exercise have to get larger; they dilate and get larger so that more blood flow can get to the heart,” he said.
Large amounts of caffeine, however, might affect not only your body, but also your brain.
“To give you an idea of products containing caffeine, Java Monster contains 100 milligrams per serving; 5 Hour Energy contains 200 milligrams per serving, and keep in mind that does not include amounts of other stimulants found in energy drinks that can enhance the effects of caffeine,” said Sheri Zidenberg-Cherr, nutrition specialist and vice chairwoman in the department of nutrition at the University of California, Davis.
The US military has even warned against troops consuming too many energy drinks since doing so has been associated with sleep disruption, leading to periods of fatigue during briefings or on guard duty.Depending on how many energy drinks you consume, doses of caffeine equal to or above 200 milligrams can be linked to caffeine intoxication, according to a paper published in the International Journal of Health Sciences in 2015.Symptoms include anxiety, insomnia, gastrointestinal irritation, muscle twitching, restlessness and periods of inexhaustibility.Taurine, a common amino acid, can affect the levels of water and minerals in your blood.Bits of guarana, the plant from the Amazon, are commonly added to energy drinks and already contain caffeine, which can increase a drink’s total caffeine amount.With the caffeine, sugar and stimulants, Higgins previously told CNN that more research is needed to determine how those ingredients could interact to cause negative health effects. We really don’t know a lot about them,” Higgins said of energy drinks. “For certain groups, it could be potentially dangerous, like for those under 18, women who are pregnant, people who have a caffeine sensitivity, people who don’t consume caffeine on a regular basis and people who are taking certain medications, like Adderall for attention deficit (disorder).” Rachel Hicks, a spokeswoman for the American Beverage Association, previously issued a statement from the group that said many people around the world have safely consumed energy drinks for more than 25 years.“Many of the ingredients in energy drinks, such as B vitamins and taurine, are found naturally in many foods,” the statement said.“Overall, the concern is that these vitamins, amino acids and herbals are often in higher concentrations than naturally in food or plants, and the effects when combined especially with caffeine may be enhanced,” Katherine Zeratsky, a clinical dietitian at the Mayo Clinic in Rochester, Minnesota, previously told CNN.Higgins, who has led multiple studies on energy drinks and health impacts, agreed.However, people who take certain medications or have a specific type of heart condition could be at increased risk of a fatal arrhythmia, or irregular heartbeat, he added.“Unlike drugs, supplements and consumer products do not necessarily get tested for safety,” Shah said in an email.