Tag Archives: density

Calcium, not smoking may limit birth-control bone loss

Calcium, not smoking may limit birth-control bone loss

Injectable birth control is known to lower bone density, but women may be able to limit the loss by not smoking and getting even moderate amounts of calcium, a new study hints.

The findings, say researchers, show that not all women are at equal risk of bone loss from using depot medroxyprogesterone (DMPA) — better known by the brand-name Depo Provera.

DMPA is given by injection about once every three months, and is generally considered an effective, convenient and low-cost form of birth control. The contraceptive can, however, lead to significant bone loss.

While research has shown that this lost bone mass is often regained after women stop using DMPA, there are still concerns about whether substantial bone loss is completely reversible. So limiting the decline in the first place would be ideal.

In the new study, researchers found that among 95 women who used DMPA for two years, those who smoked or had a low calcium intake were at particular risk of significant bone density loss — defined as a decline of at least 5 percent in the spine or hip.

Current smokers were nearly four times more likely to lose that much bone mass as non-smokers were. On the other hand, the risk declined by 19 percent for every 100 milligrams (mg) of calcium a woman got each day.

Drs. Mahbubur Rahman and Abbey B. Berenson, of the University of Texas Medical Branch in Galveston, report the findings in the journal Obstetrics and Gynecology.

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Ethnically dense neighborhood good for health

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Ethnically dense neighborhood good for health

Living in a neighborhood with a lot of people of similar ethnic background may have some health benefit, hints a new study from the United Kingdom.

In the study, fewer activity-limiting long-term illnesses were reported by people who lived in neighborhoods they felt were more than half made up of people with whom they shared a common ethnicity.

This effect was seen among white (primarily of British and Irish ancestry), Indian, Pakistani, Bangladeshi, and African race and ethnic groups, despite the tendency of ethnic minorities to “live in deprived neighborhoods,” Dr. Mai Stafford, from University College London, told Reuters Health in an email correspondence.

Stafford’s team measured actual ethnic density of various neighborhoods and asked residents for their views on the ethnic makeup of their own neighborhood.

The study included 8,850 whites, 1,299 Indians, 678 Pakistanis, 233 Bangladeshis, 690 Africans, and 820 of Caribbean ethnicity.

The investigators found general agreement between actual and perceived ethnic density, except that whites tended to underestimate the proportion of whites in their neighborhoods.

By contrast, “ethnic minority participants tended to overestimate the proportion of people from the same ethnic background as themselves in the local area,” Stafford said.

A health benefit of living in neighborhood with people of the same ethnic background was evident for all ethnic groups – except those of Caribbean ethnicity.

For unexplained reasons that need further study, those of Caribbean ethnicity reported fewer long-term illnesses associated with actual, rather than perceived, ethnic density.

In earlier research, Stafford and colleagues reported ethnic minorities living in areas with greater proportions of “co-ethnics” experience less racial discrimination and associated stress, which may partially explain the current findings.

They call for continued investigations to further explain and clarify the impact neighborhood ethnic density has on overall health.

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