- Design
- Systematic review and dose-response meta-analysis of cohort studies
- Population
- 218,378 participants in nine cohorts
- Primary outcome
- Cognitive decline, MCI, Alzheimer's disease and dementia
- Effect
- Cognitive decline OR 0.67 (0.47–0.95); lowest risk at 350–400 mg/day
This dose-response meta-analysis drew on nine independent cohorts with 218,378 participants. Higher dietary choline intake was associated with lower odds of adverse cognitive outcomes (OR 0.76, 95% CI 0.63–0.92), cognitive impairment or decline (OR 0.67, 0.47–0.95) and Alzheimer's disease (OR 0.74, 0.55–0.99), but not with all-cause dementia.
The relationship was non-linear: the lowest risk was seen at about 350–400 mg a day, with no further benefit beyond that.
These are observational associations, and people who eat more eggs, fish, legumes and dairy may differ in many ways. Nothing here supports choline supplements. It does reinforce dietary advice for older adults, including vegetarians, whose main sources are dairy, legumes and some vegetables.
- Encourage a varied diet including eggs, fish, dairy and legumes, which supply choline.
- Pay attention to diet quality in older vegetarians, whose choline intake may be lower.
- Do not recommend choline supplements on this evidence.
- No association was found with all-cause dementia.
Why it matters
It adds a specific, modifiable nutrient to dietary advice for brain health.
Don't overread it
Observational associations only; no trial shows that raising choline intake prevents decline.
The statistics, in plain English
An odds ratio of 0.67 means about one-third lower odds of cognitive decline with higher intake. In observational data this may reflect overall diet and lifestyle rather than choline itself.
Read the rest in the app
You have read your two free briefings this month. The app carries all 27 specialties, every morning, free — and this finding is waiting in it.
Scan to keep reading on your phone. No account needed to start.
Tomorrow morning, before your first patient
One edition a day for geriatrics, written by the desk, every claim tied to its paper. Six minutes.
Get the app — free