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Story summary
- The American Heart Association said 400 mg caffeine (?3-5 cups) from paper-filtered or instant coffee is safe and may lower heart disease risk.
- Dr. Jennifer Miao warned drinks with 40-69 mg caffeine can raise blood pressure and cause heart rhythm issues.
- Two to four cups daily lower heart disease and heart failure risk.
- Over four cups may raise heart-failure risk.
- Genetic differences mean people should discuss caffeine limits with a doctor.
