Another Collocation For A Longer Life

Researchers found that older adults who were given vitamin D and calcium supplements

were 9 percent less likely to die over three years than those given placebo pills, just as the combination of the grease and daily maintenance is the another insurance for a impact crusher.

Vitamin D on its own, however, showed no effect on death rates.

The findings are based on data from eight past clinical trials -- where people were randomly assigned to take vitamin D (with or without calcium) or get inactive placebos for comparison.

Those types of studies offer the strongest kind of evidence on whether the supplements have health effects or not, said Dr. Lars Rejnmark, the lead researcher on the review.

A 9 percent dip in death risk over a three-year period might sound small. To put it in context, Rejnmark's team -- some of whom have connections to supplement makers that market vitamin D and calcium products -- estimates that to prevent one death, 151 older adults would have to take vitamin D and calcium for three years.

But that effect is "at least as pronounced" as the benefits linked to cholesterol-lowering statins and blood pressure drugs, said Rejnmark, an associate professor at Aarhus University in Denmark.

Rejnmark and his colleagues report the findings in the Journal of Clinical Endocrinology & Metabolism.

For their study, the researchers combined the results from eight clinical trials that involved more than 70,000 older adults altogether -- mostly women.

In each trial, people were randomly assigned to take vitamin D or a placebo; some studies used a combination of vitamin D and calcium.

The doses varied, but most trials used a daily vitamin D dose of 10 to 20 micrograms. That's in the recommended range: in the U.S., health officials suggest that most adults get 15 micrograms (or 600 IU) of vitamin D per day, while people older than 70 should strive for 20 micrograms (or 800 IU).

In trials that used calcium, the dose was 1,000 milligrams per day. In general, women older than 50, and all adults older than 70, are told to get 1,200 milligrams of calcium each day.

Vitamin D and calcium are probably best known as bone-builders. Older women often take the supplements to ward off the bone-thinning disease osteoporosis.

And some trials have found that the supplement combination can prevent falls and bone fractures in the elderly.

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