What is the relationship between caffeine intake and blood pressure in healthy and hypertensive adults?
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 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.