A British Medical Journal article which reported on a survey of fifteen trials in which participants (all over age 40) were given at least 500 mg of elemental calcium per day. The researchers concluded that calcium supplements increase the risk of myocardial infarction by about 30% over five years.
The Alliance for Natural Health got all upset about this article being presented in a slanted form but the information should not go unheaded.
Regarding the Alliance for Natural Health comment on the British Medical Journal study report I commented as follows:
Calcium Excess causes Magnesium Deficiency and Health Risks
It is possible that taking calcium supplements without taking an equal amount of magnesium does cause heart attacks. Even though the British Medical Journal slanted the presentation of the information, it is detrimental to drink juice supplemented with calcium, to take calcium supplements, multivitamins and prenatals that contain more calcium than magnesium. Magnesium deficiency is also caused by enteral and parenteral food supplements, they contain three to five times as much calcium as magnesium. A favorite teacher of mine Dr Mildred Seelig, MD PhD taught this topic in my clinical nutrition training, look at http://www.mgwater.com or her book The Magnesium Factor to understand better about excess calcium causing magnesium deficiency and health risks including migraines, worsening asthma, increased inhaler usage need, difficulty swallowing, high blood pressure, leg cramps, restless leg syndrome, constipation, nervous tics, sudden death and more. Carolyn Dean MD, ND discusses this issue extensively in her book The Magnesium Miracle. One of the platforms of the non profit corporation COPP A LIfe Corp is this very issue, excess calcium supplementation without equal or adequate magnesium deficiency causes the above named health risks.