Being in the upper 80's, my blood pressure fluctuates due to nutritional supplements, exercise, sleeping, and you name it. I was amazed that even "organic blueberries" (Costco) raised my hypertension over time. Either they are not organic, or I have become sensitized after eating every day 1/2 cup of blueberries for a year. Thus, I am checking my blood pressuer with an Omron gadget several times a day to keep track of everything that influences my blood pressure, and drop those items that raise it.