Energy Drinks Linked to Heart Attacks and Cardiac Arrest in Young Adults, Study Shows

When you pop open that bright‑colored can after a long lecture or a night out, you probably expect a quick boost, not a medical emergency. Yet a fresh analysis presented at the AHA Scientific Sessions in Chicago suggests that, for many young adults, that boost might come with a hidden cardiac cost.

Researchers sifted through more than 28,000 FDA submissions that detail cardiovascular events – everything from chest pain and palpitations to full‑blown cardiac arrest. They then grouped the incidents by whether the culprit product contained caffeine or other stimulants.

The contrast was stark. Cardiac arrest showed up about 11 times more often when a caffeine‑laden drink or supplement was involved. Heart attacks were roughly 4.5 times as common, and ventricular arrhythmias or palpitations appeared about fourfold more frequently compared with non‑stimulant products.

About 45 % of those serious events were reported in adults between 18 and 34 years old – a demographic that usually feels invincible. The stimulants named in the study included not just caffeine, but also guarana, yerba mate, synephrine, yohimbine and a handful of other methylxanthine‑type compounds. They turn up in everything from the trendy “pre‑workout” powders to protein bars, meal‑replacement shakes and even some vitamin blends.

“We’ve known from case reports that high‑dose caffeine can be dangerous for people with underlying heart conditions,” said Dr. Colin Kane, a pediatric cardiologist at Children’s Health and professor at UT Southwestern. “What’s concerning is that many of these young, otherwise healthy individuals are now seeing heart issues that we previously thought were rare in this age group.”

The American Heart Association’s 2026 statement still says most adults can safely handle up to 400 mg of caffeine a day – roughly five eight‑ounce cups of brewed coffee. The problem is that many energy drinks pack three times that amount per ounce, and some pre‑workout formulas can contain more than a dozen times the dose.

Dr. Pamela Benavidez, a cardiothoracic anesthesiologist and senior author of the study, warned, “A single serving of many of these drinks can easily push you past the recommended daily limit. And when you add other stimulants like synephrine or yohimbine into the mix, the heart’s response becomes unpredictable, especially for young, healthy bodies.”

Her team urges anyone under 35 to keep a close eye on how they feel after consuming such products. Warning signs include a racing or irregular heartbeat, sudden chest tightness, dizziness, fainting, or palpitations that linger. If any of those symptoms appear, seek medical attention right away.

For people with a known heart condition, a family history of sudden cardiac events, or who are on medications that affect heart rhythm, the advice is even clearer: talk to a doctor before reaching for that extra‑energy can. Until more is understood, a cautious approach may be the safest way to stay energized without endangering your heart.