The current Dietary Reference Intake (DRI) for vitamin D in older adults set by the Institute of Medicine (IOM) is a minimum of 600 IUs per day for adults between 51 and 70 years-old and 800 IUs in adults over 70.
"Vitamin D supplementation is an efficient intervention for a costly injury that affects thousands of older adults each year," said Dawson-Hughes, who is also a professor at Tufts University School of Medicine. "The average recovery is long and painful and deeply impacts quality of life. After a fracture, older patients may only regain partial mobility, resulting in a loss of independence that is personally demoralizing and that can place added stress on family members and caregivers"
Financially, Vitamin D supplements cost pennies a day, Dawson-Hughes said, whereas the American Academy of Orthopaedic Surgeons estimated the cost of treating a hip fracture was $26,912 in 2007.
Dawson-Hughes adds that older adults, unless they are exposed to bright, year-round sunlight, require supplementation to meet their vitamin D needs. Typically, adults consume 150 IUs per day from food sources such as tuna or salmon or fortified milk. On average, multivitamins contain 400 IUs of vitamin D and there are individual vitamin D supplements with 400, 800 or 1,000 IUs. While vitamin D toxicity is rare, the IOM suggests capping intake at 4,000 IUs per day.
Dawson-Hughes said the results of the current study would be strengthened by large interventional trials investigating the impact of vitamin D supplementation on fracture risk. She and the authors also call for further investigation of the impact of combining calcium supplementation with high doses of vitamin D, as their data was inconclusive.
|Contact: Andrea Grossman|
Tufts University, Health Sciences Campus