The edition · Geriatrics
Not all physical activity lowers dementia risk, and the kind that pays is leisure
A meta-analysis of 4.2 million people finds leisure activity protective against dementia while occupational activity is associated with higher risk, a vegan diet costs older adults measurable muscle within twelve weeks, and frailty in hospital predicts almost every outcome that matters.
The edition in brief
The dementia prevention message has been to move more. A meta-analysis of 74 studies and 4,227,297 people suggests the domain matters as much as the amount. High leisure-time activity was associated with a 24% lower risk of all-cause dementia and household activity with 15% lower, but occupational activity carried a 20% higher risk and commuting activity 10% higher. Certainty was very low to low and heterogeneity was severe, so this reframes the advice rather than settling it: telling a manual worker they already get enough exercise may be exactly wrong. A randomised trial gave a sharper warning. Older adults who moved to a self-selected vegan diet lost 1.15 kg of appendicular lean mass and 0.61 L of thigh muscle volume over twelve weeks, against essentially no change on an omnivorous diet, with muscle protein synthesis lower too. Resistance exercise halved the loss but did not abolish it. On frailty, a network meta-analysis of 22 trials ranked exercise plus cognitive training highest for reducing frailty level. A separate synthesis of 57 cohorts found frailty in hospitalised older adults associated with more than double the mortality, worse function, less chance of going home and higher readmission. No new regulatory decisions today. The reading instead is a study of how the last relevant guideline landed: five years after anticoagulation was recommended for atrial fibrillation, over half of eligible nursing home residents were still untreated, and the oldest and frailest were least likely to be treated.
Leisure activity lowers dementia risk; occupational activity is associated with raising it
Ask what kind of activity your patient does: leisure and household activity track lower dementia risk, while a physically demanding job does not, and should not be counted as exercise.
A vegan diet cost older adults a kilogram of lean mass in twelve weeks
An older adult starting a vegan diet needs a protein target and resistance exercise from the beginning, or they will lose about a kilogram of lean mass in three months.
Score frailty on admission, because it predicts almost everything you will be asked about
Score frailty on admission and write it down: it predicts mortality, function, discharge destination and readmission, and it is far more useful on day one than on day four.
No new regulatory action, but a study of how the last guideline landed in nursing homes
Nothing new from the regulators today; the useful reading is that five years after the guideline, over half of eligible nursing home residents were still not anticoagulated, and the oldest and frailest were the least likely to be.
For frailty, exercise works better with something added to it
Pair exercise with cognitive training, nutrition or psychological support in frailty programmes — exercise alone ranked below every combination tested.
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