New research presented by the American Heart Association (AHA) indicates a concerning association between the consumption of stimulant-containing products and severe cardiovascular emergencies, including heart attacks and cardiac arrest, particularly among younger adults. The findings, unveiled at the association’s Scientific Sessions held in Chicago from November 6 to November 9, scrutinize the impact of popular energy drinks and performance-enhancing supplements.
"Some energy drinks have up to three times more caffeine per fluid ounce than brewed coffee, and some pre-workout supplements have more than 12 times as much." Dr. Pamela Benavidez, Study Senior Author and Cardiothoracic Anesthesiologist at Fairfield Medical Center
Researchers analyzed over 28,000 reports submitted to the Food and Drug Administration (FDA) detailing cardiovascular events. These incidents encompassed a range of conditions, including heart attacks, cardiac arrest, abnormal heart rhythms, chest pain, rapid heartbeat, and fainting. The analysis revealed a stark difference in the frequency of these events when associated with stimulant-containing products compared to those without such ingredients.
Specifically, cardiac arrest was reported approximately 11 times more frequently in incidents linked to caffeine and other stimulants. Heart attacks appeared about 4.5 times as often, while abnormal heart rhythms and palpitations were reported approximately four times more frequently. The study also noted increased reporting of elevated heart rates, chest discomfort, and fainting among consumers of these products.
A particularly salient finding highlighted the age demographic affected. Approximately 45% of the reported cardiovascular events associated with stimulant-containing products involved adults between the ages of 18 and 34. This raises significant questions regarding the burgeoning popularity of heavily caffeinated beverages and performance supplements within this younger demographic.
The products examined by researchers included a broad spectrum of items, such as energy drinks, soft drinks, protein bars, meal replacement shakes, smoothies, and certain vitamins. The ingredients under scrutiny included well-known stimulants like caffeine, guarana, and yerba mate, alongside others such as synephrine and yohimbine.
Dr. Colin Kane, a pediatric cardiologist at Children’s Health and a professor at UT Southwestern Medical Center, commented on the findings, stating they reinforce existing concerns. "We’ve known through case reports and anecdotal evidence that caffeine in high amounts can be potentially dangerous to people with underlying heart conditions and even those who have normal hearts," Dr. Kane told Fox News Digital.
While caffeine is widely consumed globally, medical experts emphasize that the quantity of stimulants and their combinations can significantly alter their effects. A 2026 American Heart Association scientific statement suggests that most healthy adults can safely consume up to 400 milligrams of caffeine daily. However, many energy drinks and pre-workout supplements often contain caffeine concentrations substantially exceeding those found in typical coffee servings.
Dr. Pamela Benavidez, the study’s senior author and a cardiothoracic anesthesiologist at Fairfield Medical Center in Ohio, issued a warning regarding the potency of some products. She explained, "Some energy drinks have up to three times more caffeine per fluid ounce than brewed coffee, and some pre-workout supplements have more than 12 times as much." Dr. Benavidez further highlighted concerns about products that combine caffeine with additional stimulants, whose interactive effects remain largely unknown. Such combinations could pose particular risks for individuals with pre-existing cardiovascular conditions or undiagnosed heart problems.
Researchers advise consumers to be vigilant for warning signs, including chest tightness, heart palpitations, dizziness, fainting, and unusually rapid or irregular heartbeats. These symptoms, if experienced during or after consuming stimulant-containing products, warrant immediate medical attention, as reported by the New York Post.
However, the study is accompanied by important limitations. The findings are preliminary and have not yet undergone full peer review for publication. The reliance on voluntarily submitted FDA reports means the analysis cannot definitively establish that the beverages or supplements directly caused the reported emergencies. Furthermore, the data cannot determine the overall frequency of cardiac problems among the general population who consume these products. Other contributing factors, such as strenuous exercise, alcohol consumption, medications, and underlying health conditions, may also play a role in individual incidents.
The beverage industry has pushed back against interpretations suggesting an inherent danger in energy drinks. The American Beverage Association reiterated that government food safety agencies generally consider moderate daily caffeine consumption, up to 400 milligrams, safe for adults. Andrea Wong, chief science officer of the Council for Responsible Nutrition, also cautioned against interpreting the findings as direct measurements of individual risk, noting that the reported 11-fold difference in cardiac arrest reports does not imply consumers are 11 times more likely to experience cardiac arrest.
Despite these limitations, researchers contend that the findings necessitate closer attention to stimulant exposure, particularly among younger adults who are frequent consumers of energy drinks and workout supplements. The study underscores the critical importance of monitoring total caffeine intake, understanding product ingredients, and recognizing potential warning signs to mitigate serious cardiovascular complications.
