• Intervention
    What is the relationship between caffeine intake and blood pressure in healthy and hypertensive adults?
    • Conclusion

      Six studies report that a one-time dose of caffeine (200-300 mg) raises blood pressure, by 3 to 12 mmHg in systolic blood pressure and 3 to 4 mmHg in diastolic blood pressure.  Two studies report that the effect of habitual consumption of caffeine on blood pressure is unclear. 

    • Grade: III
      • Grade I means there is Good/Strong evidence supporting the statement;
      • Grade II is Fair;
      • Grade III is Limited/Weak;
      • Grade IV is Expert Opinion Only;
      • Grade V is Not Assignable.
      • High (A) means we are very confident that the true effect lies close to that of the estimate of the effect;
      • Moderate (B) means we are moderately confident in the effect estimate;
      • Low (C) means our confidence in the effect estimate is limited;
      • Very Low (D) means we have very little confidence in the effect estimate.
      • Ungraded means a grade is not assignable.