The C.A.M. Report
Complementary and Alternative Medicine: Fair, Balanced, and to the Point
  • About this web log

    This blog ran from 2006 to 2016 and was intended as an objective and dispassionate source of information on the latest CAM research. Since my background is in pharmacy and allopathic medicine, I view all CAM as advancing through the development pipeline to eventually become integrated into mainstream medical practice. Some will succeed while others fail. But all are treated fairly here.

  • About the author

    John Russo, Jr., PharmD, is president of The MedCom Resource, Inc. Previously, he was senior vice president of medical communications at, a complementary and alternative medicine website.

  • Common sense considerations

    The material on this weblog is for informational purposes. It is not medical advice or counsel. Be smart, consult your health professional before using CAM.

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    Defining the effect of coffee on blood pressure

    Some say drinking coffee is associated with slightly higher blood pressure. However, these studies followed patients for less than 85 days.

    Researchers around the US collaborated to review the results of longer term studies.

    First, the details.

    • From 6 studies, a total of 172,567 participants (37,135 with hypertension) were included in the review.

    And, the results.

    • The average duration of follow-up ranged from 6 to 33 years.
    • A meta-analysis of the combined data showed that habitual coffee consumption of greater than 3 cups/day was not associated with an increased risk of hypertension compared with less than 1 cup/day.
    • A slightly elevated risk appeared to be associated with light-to-moderate consumption of 1 to 3 cups/day.”

    The bottom line?

    So, the risk is low. But how much of a rise in blood pressure can we expect and why does it happen?

    Dr. Sheldon Sheps, a specialist in hypertension at the Mayo Clinic tells us, “The amount of caffeine in 2 to 3 cups of coffee can raise systolic pressure (the top number in your blood pressure reading) 3 to 14 millimeters of mercury (mmHg). Your diastolic pressure (the bottom number) can be increased 4 to 13 mmHg.”

    “It’s unclear what causes this spike in blood pressure. Caffeine could block a hormone that helps keep your arteries widened. Others think that caffeine causes your adrenal gland to release more adrenaline, which causes your blood pressure to increase.”

    5/21/11 21:28 JR

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