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What do systematic reviews say?

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Evidence found and GRADE certainty

241 questions · 259 findings · 26 reviews · Headline outcomes only

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No studies found 52 · 20.1%GRADE not reported 20 · 7.7%Very low 76 · 29.3%Low 73 · 28.2%Moderate 27 · 10.4%High 11 · 4.2%

Supportive interventions for enhancing dietary intake vs comparators

All‐cause mortality · malnourished or nutritionally at‐risk adults

Supportive interventions for enhancing dietary intake probably leads to lower all‐cause mortality compared with comparators (moderate certainty).

1 finding from 1 review

Adverse event outcomes for dietary combined with physical activity interventions vs control

Body‐mass index (BMI) · children aged 12 to 18 years
3 findings from 1 review

Dietary fibre (all study interventions) vs control

Number of participantswith at least one recurrent adenoma · people with a history of colorectal adenomas

Dietary fibre (all study interventions) showed no clear difference in number of participantswith at least one recurrent adenoma compared with control (low certainty).

1 finding from 1 review