How Does Blood Pressure Work?

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Your heart is the master pump for all the blood in your body. With every heartbeat, your heart pushes your blood to all the vital parts of your body, such as muscles and bones, through a network of arteries, capillaries, and veins. As blood flows through the tube-like arteries, it presses up against the walls of the blood vessels with varying degrees of strength. The strength or weakness of this pressure is called your blood pressure (BP).

Each time your heart squeezes, moving your blood to its various destinations, your blood pressure goes up—this number is referred to by a blood pressure reading as systolic. Then, as the heart relaxes after each contraction, your blood pressure goes down; that is called the diastolic reading. Together, these two numbers are presented as a score, systolic over diastolic: Your doctor might tell you that your BP is “120 over 80.”

According to the American Heart Association (AHA), normal blood pressure should reflect systolic pressure between 90 and 120, over a diastolic pressure between 60 and 80. Your doctor may take this measurement with a fancy-named instrument called a sphygmomanometer—an inflatable rubber cuff attached to a manual air pump. When the doctor inflates the cuff at your arm with air, it temporarily cuts off blood flow, and when it releases, the blood starts flowing again, revealing those two key numbers.

Nowadays, though, doctors are recommended to use an automatic blood pressure cuff, which relies on a different method and seems to be more accurate. While the manual cuff relies on auscultation, in which the doctor listens for the correct pressures using a stethoscope/microphone, automatic blood pressure cuffs are usually oscillometric. When blood passes under the cuff, the arm increases in circumference ever so slightly. And by measuring the amplitude of the oscillations (hence oscillometric) at a continuous interval of pressures, blood pressure can be calculated in much the same way.

If you have high blood pressure, a.k.a. hypertension—approximately 130/80 or higher in a person of average health—your heart is working too hard to pump the blood through your body, which becomes dangerous. According to the AHA [PDF], elevated blood pressure is 120–129/less than 80; hypertension stage 1 is 130–139 (systolic) or 80–89 (diastolic); and hypertension stage 2 is 140 or higher (systolic) or 90 or higher (diastolic). If your blood pressure hits 180/120, you're in hypertensive crisis, and you should get help.

If you fall into the above categories, your doctor will recommend changes to diet and exercise and probably medication. High blood pressure is often a precursor to heart disease or a heart attack and can be a side effect of other diseases, such as diabetes. However, your blood pressure can temporarily rise due to stress, pregnancy, and even some common medications, including over-the-counter pain relievers and antidepressants. One high reading will not necessarily mean you have hypertension—but it’s good to keep vigilant.

Editor's note: This story was updated in July 2018 to reflect new blood pressure guidelines from the AHA.

General Mills Is Recalling More Than 600,000 Pounds of Gold Medal Flour Over E. Coli Risk

jirkaejc/iStock via Getty Images
jirkaejc/iStock via Getty Images

The FDA recently shared news of a 2019 product recall that could impact home bakers. As CNN reports, General Mills is voluntarily recalling 600,000 pounds of its Gold Medal Unbleached All-Purpose Flour due to a possible E. coli contamination.

The decision to pull the flour from shelves was made after a routine test of the 5-pound bags. According to a company statement, "the potential presence of E. coli O26" was found in the sample, and even though no illnesses have been connected to Gold Medal flour, General Mills is recalling it to be safe.

Escherichia coli O26 is a dangerous strain of the E. coli bacterium that's often spread through commercially processed foods. Symptoms include abdominal cramps and diarrhea. Most patients recover within a week, but in people with vulnerable immune systems like young children and seniors, the complications can be deadly.

To avoid the potentially contaminated batch, look for Gold Medal flour bags with a "better if used by" date of September 6, 2020 and the package UPC 016000 196100. All other products sold under the Gold Medal label are safe to consume.

Whether or not the flour in your pantry is affected, the recall is a good reminder that consuming raw flour can be just as harmful as eating raw eggs. So when you're baking cookies, resist having a taste until after they come out of the oven—or indulge in one of the many edible cookie dough products on the market instead.

[h/t CNN]

Doctors at a British Hospital Are Now Prescribing Houseplants for Depression

Halfpoint/iStock via Getty Images
Halfpoint/iStock via Getty Images

You don’t have to take a trip to the countryside to reap the mental health benefits of being around nature—a single plant might just do the trick (as long as you can keep it alive).

Fast Company reports that the Cornbrook Medical Practice in Manchester, England, is one of the first in the country to prescribe houseplants to help treat anxiety and depression. It’s part of a horticultural therapy program led by a local nonprofit called Sow the City, which leads initiatives to foster community gardens in Manchester.

It’s just as much about building a sense of community through gardening as it is about the therapeutic advantages of caring for your own house plants. “There’s evidence that people who are socially isolated have worse health outcomes,” Sow the City director Jon Ross told Fast Company. The organization has also assisted Cornbrook Medical Practice in establishing its own herb garden, which patients are welcome to help maintain. Ross and his team work closely with doctors at different offices to optimize each garden for its particular clientele—sometimes, that means building a small, flora-filled sanctuary that’s just for rest and relaxation.

Other times, it’s a fully-fledged vegetable garden. For a “Hospital Beds” program at another hospital, Sow the City installed raised vegetable beds where long-term mental illness patients can soak in some sunlight, socialize with each other, and take pride in seeing the fruits (and vegetables) of their labors flourish. There’s an added physical health benefit, too: The patients get to eat the produce. “We really don’t have good food in our public hospitals,” Ross said.

Sow the City also makes sure that no green thumbs are necessary to participate in any gardening party. Its members populate the gardens with already-healthy, easy-to-tend plants, and they’ll even train patients on how to care for them.

If you’re thinking a garden might improve your own quality of life—doctor’s orders or not—here are 10 easy-to-grow plants for first-time gardeners.

[h/t Fast Company]

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