Calcium Supplements Linked to Lower Mortality Risk

A few months ago, Women’s Health reported that excessive calcium consumption was linked to a higher risk of mortality. New research now provides more insight on the subject: In a study recently accepted for publication in The Endocrine Society’s Journal of Clinical Endocrinology & Metabolism, researchers report that taking calcium supplements—up to 1,000 mg a day—is linked with lower mortality risk.

A research team from McGill University in Canada analyzed health data from more than 9,000 people that participated in the Canadian Multicentre Osteoporosis Study—though not all of the participants actually had osteoporosis. To get the skinny on calcium supplement consumption, researchers interviewed participants in person every five years and also asked them to fill out a yearly questionnaire about which medications and supplements they were taking.

The women who reported using calcium supplements—up to 1,000 mg per day—had about a 20 percent reduced risk of dying at some point during the 10-year study. Higher doses, however, led to inconclusive results.

That’s in line with research published a few months ago that found women with a calcium intake exceeding 1,400 mg per day increased their mortality risk by 100 percent, compared to those who kept their intake between 600 and 999 mg.

All of this evidence points to the fact that the RDA for calcium—1,000 mg per day for women between the ages of 19 and 50—is in fact the best amount to aim for, says David Goltzman, MD, of McGill University.

The latest research suggests that taking calcium supplements can be a safe way to up your intake—so long as you don’t exceed 1,000 mg per day from both supplements and dietary calcium.

That said, it’s always best not to rely on supplements to meet your nutritional needs. In fact, researchers found similar reductions in the risk of mortality when people increased their dietary calcium intake, as well.

“The most appropriate way to meet your calcium needs is through your diet,” says Goltzman. “If, however, you cannot meet your average daily requirement of calcium, there would be no harm—with respect to increased death—to consume calcium supplements up to 1,000 mg per day.”

These calcium-rich foods will help you get more of the nutrient—without having to resort to a supplement:

The ingredient: Milk or calcium-fortified soy milk
Calcium content: 299 mg per 8-ounce serving (30 percent DV)
Recipe idea: Greek-Style Frittata

Photo: Craig Cutler

The Ingredient: Plain, nonfat yogurt (note: Greek yogurt has less calcium)
Calcium content: 415 mg per 8-ounce serving (42 percent DV)
Recipe idea: Blueberry Yogurt Parfait

Photo: Catherine Sears

The Ingredient: White beans
Calcium content: 96 mg per ½-cup serving (9 percent DV)
Recipe idea: Tuscan Spinach Dumplings with White Beans

Photo: Quentin Bacon

The ingredient: Kale
Calcium content: 100 mg per 1-cup serving (10 percent DV)
Recipe idea: Kale and Cannellini Beans

Photo: Mitch Mandel

Plus, check out 9 other awesome kale recipes.

The ingredient: Almonds
Calcium content: 75 mg per 1-ounce serving (7 percent DV)
Recipe idea: Shaved Brussels Sprouts with Radicchio

Photo: Kang Kim
Photo: Liquidlibrary/Thinkstock

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Is Calcium Dangerous?
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Is Calcium Dangerous?

Yogurt addicts, take note: High dietary calcium intake may be associated with increased mortality in women, according to a new study published in the British Medical Journal.

Researchers from Uppsala University in Sweden followed more than 61,000 women for an average of 19 years to test the link between calcium and mortality, gathering data from the Swedish Cause of Death Registry and the Swedish Mammography Cohort. Although women with very low calcium intake (less than 600 mg/day) saw an increased risk of death, the most shocking finding was women with a high calcium intake (more than 1400 mg/day) were more than twice as likely to die as those who consumed between 600 and 999 mg/day. The risk increased further for women noshing on calcium-rich foods while also taking supplements.

While it’s important to stay between 600 mg of calcium per day and 1400 mg/day, where your calcium comes from is also key. This week, the US Preventive Services Task Force recommended against taking calcium and Vitamin D supplements unless you have a deficiency.

“There is no scientific proof that calcium strengthens bones or prevents osteoporosis,” says endocrinologist Scott Isaacs, MD, clinical instructor of medicine at Emory University School of Medicine. “This is probably a change from what you have read or heard in the past.”

Of course, you shouldn’t nix calcium altogether. It’s still important for several physiological processes, like regulating hormones and maintaining muscles. For women ages 19 to 50, the RDA is 1,000 mg. Aim to hit that number by eating foods like dairy, tofu, kale, and broccoli—but do your math.

“Be aware of calcium in the various foods you eat,” Isaaacs says. If you tend to drink a lot of milk or eat calcium-fortified cereal, you may want to scale back. Unsure about any food’s calcium content? Check out the USDA’s nutrient database.

photo: Hemera/Thinkstock

More from Women’s Health:
Daily Vitamins: Don’t Overload Your System
Calcium Sources You Need To Include
The Best Milk For Your Health

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Do You Get Enough Calcium?

You know you need calcium for strong bones. But a new study suggests that skimping on this vital mineral could increase your risk of developing hyperparathyroidism (PHPT), a hormone condition that can suck the calcium from your bones and elsewhere if left untreated.

In the 22-year-long Nurses’ Health Study I, researchers at Brigham and Women’s Hospital at Harvard Medical School examined the calcium intake of 58,354 women between the ages of 39 and 66 who completed food frequency questionnaires every four years. What they found was that women who consumed the most calcium through food and supplements had a 44% reduced risk of developing PHPT, which is marked by an uncontrolled release of the parathyroid hormone.

In healthy bodies, the parathyroid hormone is gradually released when calcium levels are low; it takes calcium from the bones, bladder, or elsewhere and distributes it into the bloodstream to keep calcium levels within a certain range for homeostasis, explains lead study author Julie Paik, M.D., instructor and attending physician of the Brigham and Women’s Hospital at Harvard Medical School in Boston, MA. PHPT occurs when benign tumors on the parathyroid gland open the parathyroid hormone floodgates, causing symptoms such as fragile, sometimes painful bones, kidney stones, nausea, fatigue, and depression.

“We don’t know what causes these tumors, but we do know that the gland is regulated by calcium levels, and that when there are low calcium levels in the blood over a long period of time, the mutation occurs and the tumor occurs,” says Paik.

While PHPT only effects about one in 800 people, and is most common among post-menopausal women, it’s smart to begin prevention efforts now—particularly because surgery is required to treat PHPT. Your best bet is to get enough calcium through diet and supplements.

While the government recommends that women between the ages of 19 and 50 consume 1,000 mg of calcium a day, women in the study who supplemented their diets with half as much had a 59% lower risk of developing PHPT than those who took none. Because each individual’s needs are different, it’s best to talk to your physician about how much calcium you need. And in the meantime? One-thousand milligrams a day isn’t a hard goal to hit: just eat an 8-ounce low-fat yogurt (415mg) for breakfast, toss your lunch salad with 1.5 ounces of shredded cheddar cheese (307 mg), and wash down dinner with an 8-ounce glass of skim milk (299 mg).

Not down with eating dairy? Don’t sweat it. While milk, yogurt, and cheese are naturally rich in the mineral, loads of calcium can also be found in foods such as sardines (325 mg in 3 oz) and salmon (131 mg in 3 oz), plus tofu (253 mg in ½ cup) and some dark-green leafy vegetable such as kale (94 mg in 1 cup). Moreover, calcium is added to foods such as fortified OJ (375 mg in 6 oz), and some breakfast cereals (up to 1000 mg in just 1 cup!), many milk alternatives–just check the label–and these surprising foods rich in calcium, too. You can also talk to your physician about whether supplements are right for you.

photo: iStockphoto/Thinkstock

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