The Studies
While analyzing data from a recent Women’s Health Initiative (WHI) study on calcium supplementation in post-menopausal women, Dr. Ian Reid, a professor of medicine and endocrinology at the University of Auckland in New Zealand, and his colleagues discovered a link between calcium supplementation and an increased risk of heart attack. They concluded that women who took calcium supplements were 13-22% more at risk of having a heart attack than those who took no calcium, whether or not they took vitamin D. The researchers said the increased risk may be due to large amounts of calcium in the blood causing hardened arteries or blood clots. Reid’s study is published in the July 29, 2010 British Medical Journal.
The WHI study looked at the role calcium and vitamin D supplementation played in reducing the rates of bone loss and colorectal cancer in post-menopausal women. 36,182 post-menopausal women were randomized into three groups. One group supplemented with 1000 mg of calcium carbonate. Another group supplemented with both 1000 mg calcium carbonate and 400 IU of vitamin D, which helps the body to absorb calcium. The last group took a placebo. Researchers found that calcium (in the form of calcium carbonate) and vitamin D supplementation provided modest protection against loss of bone mass, but no protection against colorectal cancer. This study was published in the Feb 16, 2006 New England Journal of Medicine.
Should I Take Calcium?
Researchers say that the study is still inconclusive and we still need more information, but we should be more aware of our calcium intake, as well as our risk for heart disease. Bess Dawson-Hughes, director of the Bone Metabolism Laboratory at the Nutrition Research Center on Aging at Tufts University said that the usual advice about vitamin and mineral consumption, including calcium, holds: get as much as you can from food. And, she says, women should be sure to subtract the calcium they’re getting from food from the 1,200 mg recommended for women aged 51 and over and supplement only up to that recommended level. “You don’t need more,” she says. “There’s no upside, and there are potential adverse outcomes for very high intakes.”
Which Foods Contain Calcium?
Some good natural sources for calcium include dairy products; canned sardines or salmon with bones included; dark leafy greens such as spinach, mustard and kale; black and navy beans; almonds; broccoli and multi-grain bread.
Does the Type of Calcium I Take Matter?
If you do take calcium supplements, you might consider taking calcium citrate instead of calcium carbonate. Calcium citrate does not need the high levels of stomach acid for absorption that calcium carbonate requires. Since stomach acid production typically decreases as we get older, this can become an issue as we age. For more information on calcium supplementation and absorption, go to this article from the University of Arizona: http://ag.arizona.edu/pubs/health/az1042.pdf.





Does your jaw make popping sounds when you open your mouth? You may have TMD (tempero-mandibular joint disorder), also known as TMJ, which refers to a variety of disorders or symptoms affecting the region around the tempero-mandibular joints which connect the lower jaw to the skull. Symptoms of TMD range in number and severity and include jaw pain or stiffness; inability to fully open the mouth; popping or clicking sounds when opening the mouth; head, neck or shoulder tension; headaches; earaches; toothaches and other types of facial pain.