Meta-analysiscited by the Tayebat archiveabstract only checked A-WHT-04 standard review

Whole grains, not refined grains, linked to diabetes risk

Whole grain and refined grain consumption and the risk of type 2 diabetes: a systematic review and dose-response meta-analysis of cohort studies.

Overview

Aune D et al.. Eur J Epidemiol 2013 · PMID 24158434 · DOI 10.1007/s10654-013-9852-5

More whole grains: 32% lower diabetes risk per 3 servings/day; refined grains: no clear link.

Does the study support the specific claim? Partly · Methodological quality: moderate

Study explained simply

What did the researchers want to find out?: Grains and diabetes
How was the study done?: Meta-analysis
How many people, animals or samples were studied?: 16 cohorts
What was actually found?: Whole grains protective; refined grains neutral
How large was the observed effect?: RR 0.68 vs 0.95
What do the results mean in everyday life?: Whole grains help; refined grains not shown harmful
What are the study's limitations?: Heterogeneity
What does it say about Elawady's specific claim?: Does not show refined wheat causes diabetes
Do the results apply to Germany and Europe?: Applicable
What can explicitly not be concluded from this study?: Causation

Grain types and T2D

Study design: Meta-analysis – Systematic review and dose-response meta-analysis
Population: Cohort participants
Country: Multiple
Period: Search to 5 June 2013
Sample size: 16 cohort studies
Inclusion and exclusion criteria: Prospective cohorts

Exposure / intervention: Whole grains, refined grains, subtypes (per 3 servings/day)
Comparator: Lower intake
Endpoints: T2D
Statistical methods: Random effects

Results: Per 3 servings/day: whole grains RR 0.68 (0.58-0.81; I2 82%); refined grains RR 0.95 (0.88-1.04; I2 53%). White rice associated with increased risk; whole grain bread, cereals, wheat bran, brown rice inversely associated (few studies).
Absolute risks: not reported
Authors' conclusion: High whole grain intake, but not refined grains, is associated with reduced T2D risk; replace refined with whole grains.

Refined grains null.

Limits C-WHT-05 (refined grains null); contradicts C-GRN-05.

Applicable.

Supports whole grains, not harm from refined wheat.

Multidimensional assessment
Multidimensional assessment
Authenticity of the source	verified
Methodological quality	moderate
Risk of bias	some concerns
Precision of results	moderate
Directness	direct
Reproducibility	replicated
Consistency with the overall evidence	consistent
Regional transferability	moderate
Adequacy of the interpretation (by the archive)	not applicable

Note: according to the archive, the studies were compiled by the archive operators. Whether Dr. Elawady himself cited this study is not established.

What the archive says about the study: Listed in bibliography only (no interpretation).
A. What was actually studied?: Whole/refined grains and T2D.
B. What did the authors find?: Whole grains protective; refined grains null; white rice harmful.
C. What conclusions do the authors themselves draw?: Replace refined with whole grains.
D. What does the archive derive from it?: Implicitly supports white-flour avoidance.
E. Is this derivation scientifically justified?: Only partly: the study found no association for refined grains, and a positive one for white rice, which the system allows.
Adequacy of the interpretation (by the archive): not applicable