Energy Drinks Linked to 11-Fold Higher Cardiac Arrest Rate in Adults Under 35

A new analysis of FDA safety data, presented this week at the American Heart Association's Scientific Sessions 2026 in Chicago, found that caffeinated energy drinks and stimulant supplements showed up far more often than non-stimulant products in reports of serious cardiac events among young adults. The numbers are hard to dismiss, even with the study's limits squarely in view.

Researchers reviewed 28,345 voluntary adverse-event reports submitted to the FDA between 2017 and 2025 through the agency's FAERS database, according to an abstract published by the AHA ahead of the meeting. When they compared reports tied to energy drinks and stimulant supplements against those tied to products without caffeine or other stimulants, cardiac arrest appeared roughly 11 times more often in the stimulant group. Heart attack reports ran about 4.5 times higher. Abnormal heart rhythms were about 4 times more common, and elevated heart rate nearly 3 times more common.

The age skew is what makes the finding clinically interesting. Nearly 45 percent of the stimulant-linked cardiac reports involved adults between 18 and 34, an age group that cardiologists rarely see for primary cardiac events. Researchers couldn't pin down a clean explanation for that concentration, but a press release on the abstract pointed to a few plausible factors: young adults may consume these drinks before intense exercise, may mix them with alcohol or other drugs, or may have undiagnosed structural heart conditions that go undetected until a stressor hits.

This is a signal study, not a verdict. The researchers were explicit, in materials reviewed by the AHA newsroom, that the data can't establish that energy drinks directly cause cardiac arrest or heart attack. FAERS is a voluntary reporting system, which means it captures complaints, not incidence rates, and it can't control for what else a person was doing or taking when an event occurred. The study is also preliminary and has not completed peer review.

Still, the cardiology community is treating the numbers seriously. Dr. Gregory Marcus, a cardiologist at the University of California San Francisco and chair of the AHA's 2026 scientific statement on caffeine and cardiovascular disease, noted in a statement to the AHA newsroom that while occasional use by healthy people probably carries a small risk, people who consume these products regularly can quickly exceed the 400 milligrams per day threshold the AHA considers generally safe for most adults. Some energy drinks contain up to three times as much caffeine per fluid ounce as brewed coffee, according to Healthline's coverage of the findings.

The clinical takeaway coming out of the AHA meeting is practical and aimed directly at frontline providers. Study author Sai Samayamanthula said in the AHA release that clinicians should ask younger patients who present with palpitations, chest pain, or fainting whether they regularly consume these products. That's the kind of history question that gets skipped in a busy ED when a 22-year-old comes in clutching their chest, because the assumption is that it's anxiety or musculoskeletal. This study gives clinicians a reason to ask.

The broader context matters too. The energy drink market is not a niche product. It runs heavily on 18-to-34-year-old consumers, the same group overrepresented in these reports. Whether that prompts any regulatory action on labeling or marketing, the AHA has not said. What it has said, through this abstract and the earlier scientific statement, is that the cardiovascular biology of high-dose caffeine gives it reason to look harder at the data.

Sources cited:
- American Heart Association newsroom, Abstract MDP0323 (https://newsroom.heart.org/news/energy-drinks-stimulant-products-linked-to-cardiac-arrest-heart-attack-in-young-adults)
- Healthline (https://www.healthline.com/health-news/energy-drinks-stimulants-higher-heart-risks-young-adults)
- Medical News Today (https://www.medicalnewstoday.com/articles/fda-reports-raise-concerns-about-energy-drinks-heart-problems-young-adults)
- U.S. News & World Report / HealthDay (https://www.usnews.com/news/health-news/articles/2026-11-02/energy-drinks-can-be-a-heart-stopper-for-young-adults)
- Yahoo Health (https://health.yahoo.com/conditions/cardiovascular/articles/energy-drinks-linked-heart-problems-194939761.html)