Could High Vitamin D Harm Seniors Prone to Falls?
Stick to recommended guidelines, experts say
By Randy Dotinga
MONDAY, Jan. 4, 2016 (HealthDay News) -- Higher doses of vitamin D don't improve mobility for the elderly, and may actually raise the risk for falls among certain seniors, a new study suggests.
The small Swiss study, published in the Jan. 4 issue of JAMA Internal Medicine, doesn't say that vitamin D is harmful in routine doses. And, the researchers say seniors should continue to follow guidelines and make sure they get recommended amounts of the nutrient naturally.
However, "don't assume that because something is called a 'vitamin' it means that it is safe," cautioned Dr. Steven Cummings, research scientist with California Pacific Medical Center Research Institute in San Francisco.
Cummings is co-author, along with Dr. Douglas Kiel, of a commentary accompanying the study.
Vitamin D supplements have been suggested as a way to build muscle strength and thus prevent falls among the elderly, according to background information with the study.
Many older adults get too little vitamin D in their diet and don't spend enough time outside to get it through sun exposure, said Kiel, director of musculoskeletal research at the Institute for Aging Research at Hebrew SeniorLife in Boston, and professor of medicine at Harvard Medical School. Low levels are most common in the frailest individuals, he noted.
Inexpensive vitamin D supplements, often recommended for boosting levels of vitamin D, are widely available in the United States.
For the study, the researchers recruited 200 people in Switzerland age 70 and older -- average age 78 -- who'd fallen over the previous year. Two-thirds were female and almost 60 percent had low levels of vitamin D, the researchers said.
Participants were divided into three groups and given a form of the vitamin called D3, which is commonly available via over-the-counter supplements.
One group received the equivalent of 800 International Units (IU) a day. Another group took that dose plus a vitamin D product called calcifediol (also known as calcidiol). The third group consumed the equivalent of 2,000 IU of vitamin D3 a day.
The researchers tracked the participants for a year. They expected to see fewer falls because previous research had shown vitamin D to benefit mobility, said study lead author Dr. Heike Bischoff-Ferrari, chair of geriatrics and aging research at the University of Zurich in Switzerland.