Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

996 questions · 1,049 findings · 79 reviews · Dementia and Cognitive Improvement

No studies found 240 · 22.9%GRADE not reported 31 · 3%Very low 216 · 20.6%Low 253 · 24.1%Moderate 238 · 22.7%High 71 · 6.8%

Omega‐3 vs placebo

Any adverse event (combined: diarrhoea, urinary tract infection, falls, dizziness, agitations) · Apathy in people with mild‐to‐moderate Alzheimer's disease

Omega‐3 PUFA supplements showed no clear difference in any adverse event (combined: diarrhoea, urinary tract infection,… compared with placebo (moderate certainty).

1 finding from 1 review

Omega‐3 vs placebo

Serious adverse events "Defined as events that result in death, hospitalization, prolongation of hospitalization, or are life threatening (based on the judgment of the study physician)" (Quinn 2010) · Apathy in people with mild‐to‐moderate Alzheimer's disease

Omega‐3 PUFA supplements showed no clear difference in serious adverse events "Defined as events that result in death,… compared with placebo (high certainty).

1 finding from 1 review

Intervention not reported

Incident dementia ‐ not measured · adults with cognitive impairment/dementia and cognitively intact populations

The review found no eligible studies for this question.

1 finding from 1 review

Intervention not reported

Composite cognitive function6 (change over 16 weeks) · adults with cognitive impairment/dementia and cognitively intact populations
1 finding from 1 review

Intervention not reported

Mortality (at 3 to 4 months' · adults with cognitive impairment/dementia and cognitively intact populations

The intervention showed no clear difference in mortality (at 3 to 4 months' (moderate certainty).

1 finding from 1 review

Intervention not reported

Cardiovascular events (at 3 to 4 months' · adults with cognitive impairment/dementia and cognitively intact populations

The intervention showed no clear difference in cardiovascular events (at 3 to 4 months' (low certainty).

1 finding from 1 review