Blueberries carry a reputation built on memory research. The trial that matters most for a woman past menopause never went near the brain.
It measured whether the lining of an artery in her arm could still widen when blood pushed against it.
Forty-eight postmenopausal women, aged forty-five to sixty-five, all with blood pressure already running above normal. Twelve weeks, and twenty-two grams a day of freeze-dried highbush blueberry powder, which the researchers put at about one cup of fresh berries.
The single cell layer lining your arteries releases nitric oxide, a gas that tells the muscle underneath to relax and let the vessel open.
Superoxide, a reactive molecule the vessel wall makes constantly, reacts with nitric oxide faster than nitric oxide can reach that muscle. Estrogen restrains superoxide production, and when estrogen goes the restraint goes with it. The signal keeps getting intercepted on the way.
The compound at the center of this is malvidin, the dominant anthocyanin in highbush blueberries and most of the reason the skin looks nearly black.
Twenty-two grams of the powder carried two hundred twenty-four milligrams of anthocyanins, and blood levels of their breakdown products climbed at four, eight and twelve weeks.
At twelve weeks, the blueberry group's arteries opened ninety-six percent more per unit of blood flow than they had at the start. The placebo group did not change.
Then the researchers did the thing that makes this trial worth reading.
They ran vitamin C into a vein at a dose high enough to strip out superoxide for twenty minutes, and measured the artery again.
At the beginning of the study that infusion improved dilation in both groups. This is how you prove an impairment is oxidative. If clearing superoxide fixes the vessel, superoxide was the problem.
What a sleep researcher does at 9 PM instead of melatonin
After 45, melatonin pills work differently. Nobody mentions this at the pharmacy.
You take one at 10. You’re awake at 2 anyway, and groggy through your first coffee.
Here’s the part that rarely gets explained. Most melatonin pills contain several times more than your body naturally produces, and the morning grogginess is the price.
A top sleep expert from the University of Washington points to a different route. A 30-second bedtime step called the cherry trick.
It works with your body, not over it. It prompts your own supply of the sleep-regulating hormone, the one your brain has been making your whole life.
In research on this approach, total sleep time increased by up to 84 minutes a night. That’s roughly ten times the average gain measured with melatonin pills.
36,498 people are already using it. Susan R., from Denver: “I finally started sleeping straight through. No more tossing and turning, no more groggy mornings. For the first time in years, I wake up feeling truly rested.”
When was the last time you woke up like that?
The full explanation is in a short video. What the trick is, why it works differently after 45, and exactly what to do at 9 PM tonight.
To your health,
P.S. It’s not cherry juice, and it’s not a supplement. Thirty seconds in your kitchen, then bed. Watch how it’s done.
After twelve weeks of blueberries, the infusion did nothing. There was no longer anything left for it to rescue.
Here is what the trial did not show. Blood pressure did not move, and neither did arterial stiffness.
Blood nitrate and nitrite did not rise either, so this is not a story about making more nitric oxide. It is a story about losing less of it.
Thirty-two of the women completed the artery measurement, the intervention was a powder rather than fruit, and the US Highbush Blueberry Council helped fund the work.
Nobody has yet run this trial with berries in a bowl. What has been shown is that a cup a day of what is in those berries changed how one artery behaved, in women whose vessels were already carrying a load estrogen used to carry for them.
The Pantry Prescription
WHAT TO BUY:
Plain blueberries, fresh or frozen, with blueberries as the only thing on the ingredient panel. Frozen highbush berries are picked ripe and hold their anthocyanins well. The studied form was a freeze-dried powder standardized to 224 mg of anthocyanins per 22 g serving, which is not the same thing as fruit.
HOW MUCH:
1 cup, about 148 g, per day. The trial split its dose in two, taken 6 to 8 hours apart.
HOW OFTEN:
Every day. Measurements were taken at 4, 8 and 12 weeks, and the artery result is a 12-week result.
WHAT TO EXPECT:
Nothing you will feel. The change was in how one artery responded to blood flow, measured by ultrasound in a laboratory. Blood pressure and arterial stiffness did not improve in this trial, so do not expect a reading to shift, and do not change anything you take for blood pressure.
WHAT IT COSTS:
Store-brand frozen blueberries run roughly $2.60 to $4.20 a pound, so a cup a day is about $25 to $40 a month. Fresh costs more outside the summer season.
WHO SHOULD ASK FIRST:
Anyone on medication for diabetes, because blueberry may lower blood sugar; anyone with surgery scheduled, where the standing advice is to stop concentrated forms two weeks ahead; and anyone pregnant or breastfeeding who is thinking about more than ordinary food amounts. Blueberry leaf is a separate matter from the fruit and has not been shown to be safe to take.
Bruised Blueberries and Ricotta
Tip 1 cup of blueberries into a mortar with a wide strip of lemon zest and several grinds of black pepper, then pound until about half the berries have split and let go of their juice.
Spoon 1/2 cup of ricotta onto a plate, pile the crushed berries and all their juice over it, and finish with flaky salt.
One cup is the amount the researchers put their powder at, so this is a full day's worth in one bowl; with no mortar, a wide bowl and the back of a fork does the same job in about 3 minutes.
