# Energy drink study links high caffeine to heart risks

> New research presented at a cardiology conference found high-caffeine energy drinks linked to cardiac arrest, but experts say the study needs peer review and more investigation.
- Title: Energy drink study links high caffeine to heart risks
- Summary: New research presented at a cardiology conference found high-caffeine energy drinks linked to cardiac arrest, but experts say the study needs peer review and…
- Keywords: energy drinks, caffeine, cardiac arrest, heart health, american heart association, young adults, food and drug administration, cardiovascular risk, fact check, PolitiFact
- Source: PolitiFact — https://politifact.com/article/2026/nov/10/energy-drink-cardiac-arrest-heart-caffeine
- Author: Grace Abels
- Published: 2026-11-10T18:09:53+00:00
- Read time: 2 min
- Topics: energy drinks, caffeine, cardiac arrest, heart health, american heart association, young adults, food and drug administration, cardiovascular risk, politics, fact check
## Study links energy drinks to cardiac arrest
Research presented November seven at the American Heart Association's global Scientific Sessions conference in Chicago found high-caffeine energy drinks linked to cardiac arrest and other heart issues.
## Study led by University of Virginia researcher
The research was led by Sai Samayamanthula, a fourth-year medical student at the University of Virginia. It has not yet been published or peer-reviewed.
## Study analyzed FDA adverse event reports
The research used data from more than twenty-eight thousand adverse events from food, dietary supplements and cosmetics voluntarily reported to the Food and Drug Administration from two thousand seventeen through most of two thousand twenty-five.
## Caffeine products showed stark cardiac patterns
About eight hundred fifty reports mentioned caffeine or stimulant-containing energy drinks or dietary supplements. Cardiac arrest was reported about eleven times more often with caffeinated products compared with noncaffeinated items.
## Heart attacks and arrhythmias also elevated
Reports involving caffeinated drinks and supplements were nearly five times more likely to include heart attacks and four times more likely to include ventricular arrhythmias or heart palpitations.
## Young adults disproportionately affected
About forty-five percent of the reports linking these products to cardiovascular events involved people ages eighteen to thirty-four. Dr. Rahul Aggarwal, a cardiologist at Northwestern University, said the findings raise safety concerns for young adults.

> These findings raise an important safety concern that requires further investigation, particularly for young adults who may not consider themselves at risk for heart problems.
## Study has significant limitations
The research does not prove energy drinks caused heart problems, only highlights a link needing more study.

> It does not contain dose, ingredient-level breakdown beyond the product name, or timing between consumption and the event.
## Broader research confirms cardiovascular effects
A two thousand twenty-five review of thirty-seven studies found energy drinks caused significant acute cardiovascular effects including increased heart rate, elevated blood pressure, and risky changes in heart rhythm.
## Caffeine doses vary widely by product
An eight-ounce cup of coffee has ninety-five milligrams of caffeine, while a twelve-ounce can of Celsius energy drink contains two hundred milligrams. C four Ultimate Energy has three hundred milligrams in an eight-ounce can.
## Safe daily limit easily exceeded
The American Heart Association says consuming less than four hundred milligrams of caffeine a day is safe for most adults. A single high-caffeine energy drink can reach that threshold quickly.
## Timing and individual metabolism matter
Drinking high-caffeine energy drinks before exercise can combine with electrolyte changes and increased heart rate to raise cardiac arrest risk. Different people metabolize caffeine at remarkably different speeds, producing wildly different blood levels.

> Different people metabolize caffeine at remarkably different speeds, so the same dose consumed by two different people may result in wildly different caffeine levels in their bloodstreams.
## Doctors recommend awareness and moderation
Experts say be aware of caffeine doses in what you drink, understand your body's sensitivity, and talk with your doctor about whether energy drinks are safe for you personally.

> There are significantly higher concentrations of caffeine in most energy drinks than there are in naturally occurring sources of caffeine such as coffee or tea.
## Key takeaway

Unpublished research links high-caffeine energy drinks to cardiac arrest in young adults, though doctors say more rigorous study is needed before drawing firm conclusions.