So, I thought to myself, "What have I been doing differently?" And then it occurred to me, "Well, I've been eating a lot of bananas [in smoothies]. Could that be it?" Then I went to the internet, did some digging, and learned that there are dozens of references to the high potassium in bananas helping to lower blood pressure. Here are a couple of abstracts worth reading:
ROLE OF POTASSIUM IN REGULATING BLOOD PRESSURE
EFFECT OF BANANA ON COLD-STRESS INDUCED HYPERTENSION
BLOOD PRESSURE CHART AND TIPS
DISCLAIMER: Please speak with your doctor before changing your diet.