The edition · Geriatrics
Not all activity protects the ageing brain — leisure helps, work may harm
A 4.2-million-person analysis finds leisure-time activity linked to less dementia while occupational activity is linked to more, a randomised trial shows a self-selected vegan diet strips muscle from healthy older adults unless they lift weights, and frailty on admission predicts who will lose independence.
The edition in brief
The dementia-prevention message 'stay active' turns out to depend on which activity. A systematic review of 74 studies and 4.2 million people found high overall physical activity associated with less all-cause dementia (relative risk 0.80), Alzheimer's disease (0.79) and vascular dementia (0.71) — but the direction reversed by domain. Leisure-time (RR 0.76) and household activity were protective, while occupational (RR 1.20) and commuting activity (RR 1.10) were associated with higher risk, probably reflecting strenuous, low-autonomy work rather than exercise. Certainty was low, so this refines advice rather than proving cause: recommend leisure-time activity specifically, not simply 'more movement'. A randomised trial delivered a sharp warning about unsupervised plant-based eating in older age. Over 12 weeks, 72 healthy adults aged 65 or over on a self-selected vegan diet cut protein intake by around 20–28 g/day and lost thigh muscle volume (-0.61 L) and appendicular lean mass (-1.15 kg) versus omnivores, who lost none. Adding resistance exercise halved the muscle loss. A vegan diet in older adults needs deliberate protein and resistance training, not good intentions. A meta-analysis of 57 cohorts confirmed frailty on admission predicts worse activities of daily living, higher mortality (RR 2.26), non-home discharge and readmission — an argument for routine frailty screening. No new geriatric drug action today; the Age-Friendly 4Ms framework remains the organising standard.
For dementia prevention, recommend leisure activity — not just 'more movement'
Recommend leisure-time physical activity specifically for dementia prevention; strenuous occupational activity was associated with higher, not lower, risk, so do not treat a physical job as brain-protective.
A self-selected vegan diet stripped muscle from healthy older adults
Warn older adults adopting a vegan diet that doing it casually cost about 1 kg of lean mass in 12 weeks — it needs planned protein intake and resistance training to protect muscle.
Frailty on admission predicts who loses independence
Screen for frailty on admission and act on it — frail older adults have double the mortality and far higher readmission, so start functional assessment and discharge planning on day one.
No new drug action for older-adult care; the 4Ms framework is the standard
No new geriatric drug regulation today; run every older-adult admission through the Age-Friendly 4Ms — what matters, medication review and deprescribing, mentation, and mobility.
Ask what kind of active, and check the protein
Turn 'stay active and eat well' into two specific questions — what kind of activity, and how much protein — because leisure exercise and adequate protein are what actually protect the ageing brain and muscle.
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