Calcium News and Research

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Calcium, the most abundant mineral in the body, is found in some foods, added to others, available as a dietary supplement, and present in some medicines (such as antacids). Calcium is required for muscle contraction, blood vessel expansion and contraction, secretion of hormones and enzymes, and transmitting impulses throughout the nervous system. The body strives to maintain constant concentrations of calcium in blood, muscle, and intercellular fluids, though less than <1% of total body calcium is needed to support these functions.

The remaining 99% of the body's calcium supply is stored in the bones and teeth where it supports their structure. Bone itself undergoes continuous remodeling, with constant resorption and deposition of calcium into new bone. The balance between bone resorption and deposition changes with age. Bone formation exceeds resorption in growing children, whereas in early and middle adulthood both processes are relatively equal. In aging adults, particularly among postmenopausal women, bone breakdown exceeds formation, resulting in bone loss that increases the risk of osteoporosis over time.

Races react differently to dietary salt

African-American and Caucasian adolescent girls handle sodium and calcium differently, which may help explain why the races have different rates of hypertension and osteoporosis, according to research at Purdue University.

10 May 2005

Carbonated soft drinks can cause heartburn

Carbonated soft drinks and one of the most commonly prescribed sleeping pills, benzodiazepines, can cause nighttime heartburn, according to new research.

9 May 2005

New study suggests you might benefit from adding more low-fat dairy to your diet

A new study suggests that increased intake of lowfat dairy foods, as part of a DASH-based eating plan, may lower blood pressure more effectively than a conventional low-fat diet -- a significant finding for the estimated 1 in 3 Americans who suffer from high blood pressure.

9 May 2005

MDCT highly accurate for diagnosing coronary artery disease in patients with zero to moderate coronary calcification

In patients with no or moderate coronary calcification, 16-slice MDCT allows the reliable detection of coronary artery stenosis with high diagnostic accuracy, say researchers from Tuebingen University Hospital in Germany. Coronary artery stenosis is the narrowing of coronary arteries due to the build-up of calcified plaques.

3 May 2005

Acupuncture treatment no more effective than sham treatment in reducing migraine headaches

Migraine patients who received true acupuncture had no decrease in headaches as compared with those who received sham acupuncture treatment, according to a study in the May 4 issue of JAMA.

3 May 2005

Discrimination leads to coronary artery calcification in African-American women

The more discrimination African-American women report, the more likely they are to have coronary artery calcification, a buildup of calcium in the vessels that is associated with atherosclerosis, according to a study presented at the American Heart Association's 45th Annual Conference on Cardiovascular Disease Epidemiology and Prevention.

1 May 2005

Fiber supplements may lower cardiovascular risk in type 2 diabetics

Fiber supplements lower "bad" low-density lipoprotein (LDL) cholesterol and increase "good" high-density lipoprotein (HDL) cholesterol in people with type 2 diabetes, according to a study presented at the American Heart Association's Sixth Annual Conference on Arteriosclerosis, Thrombosis and Vascular Biology.

1 May 2005

$No evidence that calcium and vitamin D prevent fractures$

No evidence that calcium and vitamin D prevent fractures

A study in this week's British Medical Journal (BMJ) finds no evidence that calcium and vitamin D supplements reduce the risk of fractures in older women living in the community.

28 Apr 2005

$Taking extra vitamin D and calcium will not prevent fractures in seniors$

Taking extra vitamin D and calcium will not prevent fractures in seniors

Surprising new research has found that taking vitamin D or calcium does not help prevent repeat fractures in elderly people. In two studies by teams at Aberdeen and York universities, researchers looked at people who had already had a fracture due to osteoporosis, a condition which increases a person's risk of bone fractures.

28 Apr 2005

Molecular mechanism that desensitizes us to cold, discovered

Mount Sinai School of Medicine researchers have discovered how the membrane protein that allows us to sense cold works and how this protein becomes desensitized so that one no longer feels the cold.

27 Apr 2005

$Giving elderly people regular supplements of vitamin D and calcium to prevent secondary bone fractures is ineffective$

Giving elderly people regular supplements of vitamin D and calcium to prevent secondary bone fractures is ineffective

Elderly people who have osteoporosis have a high risk of bone fractures and those who previously had a fracture are at an increased risk of having another. Vitamin D and calcium, alone or in combination, are often recommended for the prevention of osteoporotic fractures.

27 Apr 2005

Common chest X-ray in the elderly can reveal osteoporosis

According to Canadian researchers undetected osteoporosis in the elderly might be discovered if chest X-rays that are done for other reasons were examined for fractures of the vertebrae.

27 Apr 2005

Isotopes for society

The nucleus of an atom contains protons and neutrons. However, some atoms of the same chemical element can have varying numbers of neutrons, giving so-called isotopes of that element.

27 Apr 2005

P12 protein influences key cell-signaling pathway

New research shows that a protein produced by a cancer-causing virus influences a key signaling pathway in the immune cells that the virus infects. This stimulates the cells to divide, helping the virus spread through the body.

26 Apr 2005

Exposure to air pollutants increases the risk of fatal myocardial infarction

Cardiovascular diseases are the most common cause of death in Sweden and other Western European countries. Known risk factors include age, gender, hereditariness, smoking, hypertension and high blood lipid levels.

22 Apr 2005

New method for the study of ion channel gating kinetics

An ion channel is a protein pore that lets ions (charged atoms such as calcium) pass through a cell's membrane. The method fits data to a new class of models, called manifest interconductance rank (MIR) models, which will give researchers a better understanding of the mechanisms by which ion channels open and close.

19 Apr 2005

Men who drink milk at more risk of Parkinsons disease

Korean University researchers say drinking a glass or two of milk a day may increase the risk of Parkinson's disease in middle-aged men, but the apparent link is unlikely to be due to milk's main nutritional ingredient, calcium.

7 Apr 2005

Process called sumoylation regulates key ion channel

Researchers at the University of Chicago have found that a recently discovered biological process known as sumoylation -- until now thought to be active only in the nucleus -- also occurs near the cell's surface where it regulates at least one and possibly many kinds of proteins, providing a novel target for the development of new drugs.

7 Apr 2005

Diuretics work better for high blood pressure

Study results by faculty members of the University of Texas School of Public Health at Houston suggests that the older, cheaper diuretics remain the drug of choice for both black and non-black patients in treating high blood pressure and reducing risk of heart disease, and confirms earlier findings that diuretics rather than newer, more expensive drugs such as ACE inhibitors, calcium channel blockers, or beta blockers should be preferred as a first therapy for most patients.

5 Apr 2005

Dallas heart study researchers find no link between Lp(a), calcium

The latest findings from the historic Dallas Heart Study have ruled out one of the most prominent explanations of why elevated levels of a fat-carrying protein called "lipoprotein(a)" lead to increased risks for heart attacks among whites but not among African-Americans.

5 Apr 2005