Home safety changes cut falls, mostly for people already at high risk

Removing hazards at home — loose rugs, poor lighting, a missing grab rail — reduces falls in older people, but the benefit is concentrated almost entirely in those already at high risk of falling. In people not selected for that risk, the best evidence shows no reduction at all. And the supplement most often reached for, vitamin D, has been judged by the US Preventive Services Task Force to have no benefit for preventing falls [s1][s3].

That is the practical shape of the home-safety evidence, and it matters because falls are the leading cause of injury-related death in older adults. In 2018, 27.5% of US community-dwelling adults 65 and older reported at least one fall in the previous year and 10.2% reported a fall-related injury; an estimated 38,742 deaths resulted from fall-related injuries in 2021 [s2].

What the home-hazard evidence actually shows

A 2023 Cochrane review pooled 22 randomised trials from 10 countries, involving 8,463 community-dwelling older people — on average 78 years old, 65% women — testing environmental interventions such as hazard reduction, assistive technology and home modification [s1].

For home fall-hazard reduction specifically — assessing hazards and making changes such as non-slip strips on steps, or behavioural strategies such as avoiding clutter — the review drew a sharp distinction the headline number hides. Overall, these interventions probably reduce the rate of falls by 26% (rate ratio 0.74, 95% confidence interval 0.61 to 0.91; 12 studies, 5,293 participants; moderate-certainty evidence) [s1].

But that average pools two very different populations. In trials that selected people at higher risk of falling, hazard reduction cut the fall rate by 38% (rate ratio 0.62, 95% CI 0.56 to 0.70; nine studies; high-certainty evidence) — translated by the review as 702 fewer falls per 1,000 people a year against a control-group rate of 1,847 [s1]. In trials that did not select for fall risk, there was no evidence of any reduction (rate ratio 1.05, 95% CI 0.96 to 1.16; six studies; high-certainty evidence) [s1]. The pattern held for the number of people who fell at least once: an 11% reduction overall (risk ratio 0.89, 95% CI 0.82 to 0.97; moderate certainty) [s1].

The reading is not that home changes are useless. It is that they earn their keep for someone with a track record of falls, a recent hospital stay, or difficulty with balance and mobility — and that fitting grab rails for a robust 66-year-old who has never fallen is a weaker bet than the marketing for such products implies.

Vitamin D: a plain verdict

Vitamin D supplements are widely taken in the belief that they prevent falls. The USPSTF, reviewing the trial evidence in adults 65 and older who are not known to have osteoporosis or vitamin D deficiency, "found adequate evidence that vitamin D supplementation has no benefit in preventing falls in older adults" and judged its overall harms small to moderate [s3]. The Task Force does not recommend it for this purpose. This applies to fall prevention in the general older population; it is a separate question from treating a diagnosed deficiency, which is a clinical decision.

What the guideline steers toward instead

Both the 2018 and 2024 USPSTF statements point to movement, not hardware or pills. In 2024 the Task Force recommended exercise interventions to prevent falls in community-dwelling adults 65 and older at increased risk (a B recommendation), concluding with moderate certainty that they provide a moderate net benefit [s2]. Multifactorial interventions — tailored packages that may include a home-hazard assessment alongside medication review and balance work — were given a weaker C recommendation, to be individualised, because their routine net benefit is small [s2].

That places home modification where the evidence puts it: as one component of a package for a higher-risk person, most convincing when paired with the intervention that carries the strongest data of all, the right kind of exercise. The muscle loss that undermines balance in later life, sarcopenia, is itself addressed mainly through resistance training rather than supplements — the same lesson the vitamin D evidence in healthy adults keeps returning.

What to watch

The high-certainty split in the Cochrane data — a large effect in high-risk people, none in unselected ones — is the kind of finding that gets flattened into "home safety prevents falls" by anyone selling a product. For a reader, the useful question is not whether to remove hazards but whether the person is at genuine risk; that is what turns a sensible tidy-up into a measurable reduction in falls. Anyone with a history of falls or unsteadiness should raise it with a clinician, who can assess risk formally rather than by guesswork.