Are coffee and energy drinks bad for the heart? Here’s what we know

Health & Fitness
22 Jul 2026 • 7:18 PM MYT
The Independent
The Independent

The world’s most free-thinking newspaper

Are coffee and energy drinks bad for the heart? Here’s what we know

  • A new study by the American Heart Association (AHA) has investigated the impact of caffeine consumption on adult heart health.
  • The research, published in AHA Journals, suggests “most adults can safely consume up to five 8-ounce cups of regular black caffeinated coffee per day”, and this amount of consumption may even be associated with a lower risk of cardiovascular disease.
  • However, high doses of caffeine, such as from energy drinks or energy shots, can cause a significant increase in blood pressure and a risk of abnormal heart rhythms.
  • A typical cup of coffee tends to contain 9.5mg to 20.6mg of caffeine per fluid ounce, whereas some energy drink shots have 40mg to 69mg.
  • Researchers say that caffeine response varies by individual factors like age, genetics, and health conditions.

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