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Caffeine restriction: effect on mild hypertension.

T M MacDonald1, K Sharpe, G Fowler

  • 1Department of Medicine and Therapeutics, Aberdeen Royal Infirmary.

BMJ (Clinical Research Ed.)
|November 16, 1991
PubMed
Summary
This summary is machine-generated.

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Modifying dietary caffeine intake does not affect blood pressure in patients with mild or borderline hypertension. Abstaining from caffeine offers no blood pressure benefits for this group.

Area of Science:

  • Cardiovascular Medicine
  • Nutritional Science
  • Clinical Hypertension Research

Background:

  • Mild and borderline hypertension affect a significant population, with dietary factors like caffeine intake being potential modulators.
  • Understanding the impact of caffeine on blood pressure is crucial for managing hypertensive individuals.

Purpose of the Study:

  • To investigate the effects of altering dietary caffeine consumption on both ambulatory and clinic blood pressure.
  • To assess whether caffeine abstinence or consumption of caffeinated coffee influences blood pressure in patients with mild/borderline hypertension.

Main Methods:

  • A randomized, four-way crossover trial involving 52 patients with untreated mild/borderline hypertension.
  • Participants followed four two-week dietary regimens: normal, caffeine-free, caffeine-free with decaffeinated coffee, and caffeine-free with caffeinated instant coffee.

Related Experiment Videos

  • Blood pressure was monitored using 24-hour ambulatory monitoring and clinic measurements; plasma caffeine levels confirmed compliance.

    • Main Results:

    • No significant differences in mean 24-hour ambulatory blood pressure or blood pressure variability were observed across the different dietary regimens.
    • A caffeine-free diet alone was associated with higher morning diastolic ambulatory blood pressure compared to consuming caffeinated coffee.
    • Clinic systolic blood pressure at 17:00 was significantly higher on a caffeine-free diet compared to when caffeinated coffee was consumed.

    Conclusions:

    • Consuming caffeinated instant coffee for two weeks does not adversely affect blood pressure in individuals with borderline or mild hypertension.
    • There is no demonstrable benefit to abstaining from caffeine in this patient population regarding blood pressure control.