What do systematic reviews say?

Dietary interventions vs control

Dietary intervention showed no clear difference in mortality compared with control (low certainty).

• Dietary interventions for adult cancer survivors 2019 · Cochrane Headline outcomes only
  HR 0.98 [0.77, 1.23]
  1 study · 3107 participants
  Low

Mediterranean dietary intervention vs another dietary intervention

Mediterranean dietary intervention showed no clear difference in CVD mortality compared with another dietary intervention (low certainty).

• Mediterranean‐style diet for the primary and secondary prevention of cardiovascular disease 2019 · Cochrane Headline outcomes only
  HR 0.81 [0.5, 1.32]
  1 study · 7447 participants
  Low

Mediterranean dietary intervention vs another dietary intervention

Mediterranean dietary intervention showed no clear difference in total mortality compared with another dietary intervention (low certainty).

• Mediterranean‐style diet for the primary and secondary prevention of cardiovascular disease 2019 · Cochrane Headline outcomes only
  HR 1 [0.81, 1.24]
  1 study · 7447 participants
  Low

Mediterranean dietary intervention vs no intervention or minimal intervention

The review found no eligible studies for this question.

• Mediterranean‐style diet for the primary and secondary prevention of cardiovascular disease 2019 · Cochrane Headline outcomes only
  no estimate extracted
  Studies not reported
  No studies found

Mediterranean dietary intervention vs no intervention or minimal intervention

The review found no eligible studies for this question.

• Mediterranean‐style diet for the primary and secondary prevention of cardiovascular disease 2019 · Cochrane Headline outcomes only
  no estimate extracted
  Studies not reported
  No studies found

Dietary advice vs standard‐of‐care therapy

• Dietary advice interventions in pregnancy for preventing gestational diabetes mellitus 2017 · Cochrane Headline outcomes only
  no estimate extracted
  1 study · 159 participants
  Very low

Dietary advice vs standard‐of‐care therapy

• Dietary advice interventions in pregnancy for preventing gestational diabetes mellitus 2017 · Cochrane Headline outcomes only
  no estimate extracted
  0 studies · 0 participants
  GRADE not reported

Mediterranean dietary intervention vs usual care

Mediterranean dietary intervention may leads to lower CVD mortality compared with usual care (low certainty).

• Mediterranean‐style diet for the primary and secondary prevention of cardiovascular disease 2019 · Cochrane Headline outcomes only
  RR 0.35 [0.15, 0.82]
  1 study · 605 participants
  Low

Mediterranean dietary intervention vs usual care

Mediterranean dietary intervention may leads to lower total mortality compared with usual care (low certainty).

• Mediterranean‐style diet for the primary and secondary prevention of cardiovascular disease 2019 · Cochrane Headline outcomes only
  RR 0.44 [0.21, 0.92]
  1 study · 605 participants
  Low

Supportive interventions for enhancing dietary intake vs comparators

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

• Supportive interventions for enhancing dietary intake in malnourished or nutritionally at‐risk adults 2016 · Cochrane Headline outcomes only
  RR 0.78 [0.66, 0.92]
  12 studies · 6683 participants
  Moderate