Calcium and vitamin D supplements are often taken to promote bone health, especially among older individuals. However, a comprehensive review published in The BMJ indicates that these supplements might not offer significant protection against falls or broken bones for most older adults.
Falls are a serious health issue as one ages. In fact, about one in three adults aged 65 and over falls every year, and those incidents can lead to fractures, chronic pain, a loss of independence, diminished quality of life, and, in some cases, relocation to assisted living facilities. So, it’s crucial to discover effective ways to prevent falls and fractures; it’s quite an important public health concern.
Longstanding Questions About Bone Supplements
Calcium and vitamin D have traditionally been linked to maintaining bone health. Calcium serves as a key structural element of bones, while vitamin D aids the body’s absorption of calcium and plays a role in normal bone metabolism.
Nevertheless, previous reviews of evidence have often shown that consuming calcium or vitamin D on their own does not effectively reduce fracture risk. The outcomes have been inconsistent when both are taken together, and researchers have also remained uncertain on whether vitamin D significantly decreases the risk of falls.
Despite these lingering questions, many healthcare professionals, guidelines, and regulatory bodies continue to recommend vitamin D supplements (with or without calcium) for bone health, and prescriptions for these supplements have notably increased over recent years.
Researchers Reviewed 69 Randomized Trials
To clarify matters, researchers from Canada reviewed data from 69 randomized controlled trials that involved 153,902 adults.
Randomized controlled trials are highly regarded for testing the effectiveness of treatments, as participants are divided into different treatment groups, which helps limit the influence of other variables.
The studies compared calcium, vitamin D, or a combination of both against either a placebo or no treatment. The main focus was whether these supplements helped lower the incidence of fractures and falls.
While the quality of the studies varied, the research team evaluated the risk of bias and certainty of evidence using recognized methods.
Little Evidence of Meaningful Fracture Prevention
After establishing criteria for what would be considered a clinically meaningful benefit, the researchers concluded there was little to no impact on the likelihood of experiencing fractures.
For calcium supplements, this finding was based on moderate certainty evidence from 11 trials with 9,067 participants.
On the other hand, for vitamin D supplements, the researchers discovered high certainty evidence from 36 trials encompassing 92,045 participants.
Similarly, the combination of calcium and vitamin D also showed little to no significant effect, backed by high certainty evidence from 15 trials that included 51,126 participants.
This pattern persisted when the researchers examined specific outcomes like hip fractures and falls. The supplements—calcium, vitamin D, and the combination—demonstrated minimal to no impact, with most evidence rated at moderate to high certainty.
Important Exceptions Remain
However, the researchers cautioned that some aspects of their analysis were grounded in a relatively small number of trials or participants, suggesting that these findings should be approached with caution.
The conclusions might not hold true for everyone. Particularly, individuals with certain bone disorders or those undergoing osteoporosis treatment may have different requirements and shouldn’t automatically apply these findings to their situations.
Nevertheless, the results remained consistently so when accounting for variables like age, sex, previous fractures, past falls, and average calcium intake from food, which bolstered confidence in the overall outcomes.
Researchers Question Routine Supplementation
In light of these findings, the researchers assert that the evidence “does not support routine supplementation with calcium or vitamin D, or combined supplementation to prevent fractures and falls.” They believe that healthcare providers, guideline panels, and regulatory agencies should reconsider their general recommendations regarding calcium and vitamin D supplementation based on current evidence.
Authors of a linked editorial emphasized the need for more rigorous and well-designed trials to establish whether supplementation might benefit individuals at notably high risk.
Exercise May Offer More Meaningful Protection
For the time being, the editorial’s authors recommend directing more attention and funding toward strategies that have already demonstrated substantial benefits in preventing falls and related injuries.
Such approaches might include balance training and resistance exercises, which can enhance strength, stability, and overall physical function.
Programs that integrate several strategies may also prove beneficial. These can range from exercise to evaluating hazards that could lead to falls, along with tailored education based on an individual’s unique risk factors.
Overall, the findings imply that preventing falls and fractures among older adults might take more than just adding calcium or vitamin D supplements to one’s daily routine.
