TOO MUCH CALCIUM CAN CAUSE
KIDNEY STONES
Women who take calcium or vitamin D pills daily are at
greater risk of developing kidney stones, a new study has warned.Researchers at
the Creighton University Medical Center in the U.S. found that women who took
the vitamin supplements for over a year were found to have higher calcium
levels in their blood and urine, a condition called hypercalciuria, which could
increase the risk of kidney stones.“The use of calcium and vitamin D
supplementation may not be as benign as previously thought,” said lead study
author Dr. Christopher Gallagher, director of the Bone Metabolism Unit at
Creighton.“Pending further information, people should not exceed the guidelines
suggested, which are 800 international units of vitamin D, and 800-1,200 mg per
day of calcium,” he said.
According to the researchers, taking vitamin supplements
has become a widespread practice throughout many parts of the world. Despite
their popularity, the precise health effects of long-term calcium and vitamin D
supplementation still remain unclear, they said.Past research has indicated
that elevated calcium in the blood, or hypercalcemia, could increase the risk
of kidney stones. It is associated with many complications, including bone and
kidney problems.In the new study, presented at The Endocrine Society’s 94th
annual meeting in Houston, Gallagher and his team studied 163 healthy,
postmenopausal women aged between 57 and 85 years.
All subjects were randomly given a vitamin D supplement
of 400, 800, 1600, 2400, 3200, 4000, or 4800 international units a day, or
placebo. Their calcium intake was then raised from a daily initial intake of
691 mg to 1,200-1,400mg.The researchers measured blood and urinary calcium
levels at the beginning of the study, and then every three months for one year.
It was found that 33 per cent of subjects developed high urinary levels of
calcium at some time in the study.These participants had 88 episodes of high
urinary calcium or hypercalciuria, which has already been linked to an
increased risk of kidney stones.It’s not clear whether the extra calcium, the
vitamin D or both together cause these problems. However, it’s possible that
long-term use of supplements causes hypercalciuria and hypercalcemia, and this
can contribute to kidney stones, Gallagher said.Thus, it’s important to monitor
blood and urine calcium levels in people who take these supplements on a
long-term basis, he added. vitamin D, kidney stones
Prof.
John Kurakar
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