Have you exfoliated lately?
Wildfires: How to cope when smoke affects air quality and health
PTSD: How is treatment changing?
Virtual mental health care visits: Making them work for you
How healthy is sugar alcohol?
A bird flu primer: What to know and do
New urine test may help some men with elevated PSA avoid biopsy
Dupuytren’s contracture of the hand
Why play? Early games build bonds and brain
Moving from couch to 5K
Heart Health
A healthy, balanced diet plays a major role in blood pressure control. And you should consume some specific minerals on a regular basis for good blood pressure management: calcium, magnesium, and potassium. But do most of us get enough of these? “If you’re eating a healthy diet, you probably have nothing to worry about. But people eating a diet of processed and canned foods or taking certain medications might not be getting enough of these micronutrients,” says Dr. Randall Zusman, director of the Division of Hypertension at the Massachusetts General Hospital Heart Center.
Images: Thinkstock
1/2 cup canned white
beans: 595 milligrams (mg)
of potassium, 67 mg of magnesium,
and 96 mg calcium.
3 ounces of cooked
halibut: 490 mg of
potassium, and 91 mg of
magnesium.
Potassium
Normal body levels of potassium are important for muscle function, including relaxing the walls of the blood vessels. This lowers blood pressure and protects against muscle cramping. Normal potassium levels also are important for the conduction of electrical signals in the nervous system and in the heart. This protects against an irregular heartbeat.
Potassium is found naturally in many foods, such as prunes, apricots, sweet potatoes, and lima beans. But food may not be enough to keep up your potassium levels if you take a diuretic for high blood pressure such as hydrochlorothiazide (Esidrix, HydroDiuril). These drugs cause potassium to leave your body in the urine, thereby lowering your body’s potassium levels. “I’d say at least a third of patients on diuretics for heart failure or high blood pressure or edema don’t get enough potassium from their diets. In those cases, we do use supplements,” says Dr. Zusman. Don’t try a supplement on your own. Too much potassium, like too little, can lead to dangerous irregular heart rhythms.
The Recommended Dietary Allowance (RDA) of potassium is 4.7 grams per day for both men and women ages 51 and older.
Magnesium helps regulate hundreds of body systems, including blood pressure, blood sugar, and muscle and nerve function. We need magnesium to help blood vessels relax, and for energy production, and bone development. Just like potassium, too much magnesium can be lost in urine due to diuretic use, leading to low magnesium levels.
The National Institutes of Health (NIH) reports that most older adults in the U.S. don’t get the proper amount of magnesium in their diets, although extreme magnesium deficiency is very rare. It’s best to get the mineral from food, especially dark, leafy green vegetables, unrefined grains, and legumes. The RDA of magnesium is 420 milligrams (mg) per day for men ages 50 and older; 320 mg/day for women ages 50 and older.
Too much magnesium from a supplement or from magnesium-containing drugs such as laxatives may cause diarrhea. There are no known adverse effects of magnesium intake from food.
Calcium is important for healthy blood pressure because it helps blood vessels tighten and relax when they need to. It’s also crucial for healthy bones and the release of hormones and enzymes we need for most body functions. We consume it naturally in dairy products, fish (such as canned salmon and sardines), and dark, leafy greens.
The RDA of calcium for men ages 51 and older is between 1,000 and 1,200 mg per day. For women ages 51 and older it’s 1,200 mg per day. However, many experts believe that these levels are set too high and some studies suggest an association between calcium supplements and higher risk of heart disease.
“It’s been controversial, so most of us advise our patients to get their calcium from food rather than from supplement pills,” says Dr. Zusman. If it’s not possible to get enough calcium from food, talk with your doctor if you think you may need a calcium supplement.
As a service to our readers, Harvard Health Publishing provides access to our library of archived content. Please note the date of last review or update on all articles.
No content on this site, regardless of date, should ever be used as a substitute for direct medical advice from your doctor or other qualified clinician.
Have you exfoliated lately?
Wildfires: How to cope when smoke affects air quality and health
PTSD: How is treatment changing?
Virtual mental health care visits: Making them work for you
How healthy is sugar alcohol?
A bird flu primer: What to know and do
New urine test may help some men with elevated PSA avoid biopsy
Dupuytren’s contracture of the hand
Why play? Early games build bonds and brain
Moving from couch to 5K
Heart Health
Heart Health
Heart Health
Get the latest in health news delivered to your inbox!
© 2024 Harvard Health Publishing® of The President and Fellows of Harvard College
Do not sell my personal information | Privacy Policy and Terms of Use
Thanks for visiting. Don’t miss your FREE gift.
The Best Diets for Cognitive Fitness, is yours absolutely FREE when you sign up to receive Health Alerts from Harvard Medical School
Sign up to get tips for living a healthy lifestyle, with ways to fight inflammation and improve cognitive health, plus the latest advances in preventative medicine, diet and exercise, pain relief, blood pressure and cholesterol management, and more.
Health Alerts from Harvard Medical School
Get helpful tips and guidance for everything from fighting inflammation to finding the best diets for weight loss…from exercises to build a stronger core to advice on treating cataracts. PLUS, the latest news on medical advances and breakthroughs from Harvard Medical School experts.
BONUS! Sign up now and
get a FREE copy of the
Best Diets for Cognitive Fitness
Stay on top of latest health news from Harvard Medical School.
Plus, get a FREE copy of the Best Diets for Cognitive Fitness.
