Narrative reviewcited by the Tayebat archiveabstract only checked★ key study A-LEG-05 in-depth review

Iron absorption from different diets

Iron bioavailability and dietary reference values.

Overview

Hurrell R, Egli I. Am J Clin Nutr 2010 · PMID 20200263 · DOI 10.3945/ajcn.2010.28674F

Iron absorption is lower from vegetarian than mixed diets; in varied diets single inhibitors matter less than iron status.

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

Study explained simply

What did the researchers want to find out?: Estimate iron bioavailability
How was the study done?: Review
How many people, animals or samples were studied?: Isotope studies
What was actually found?: 14-18% mixed, 5-12% vegetarian
How large was the observed effect?: Not applicable
What do the results mean in everyday life?: Combine legumes with vitamin C or meat/fish.
What are the study's limitations?: Not legume-specific
What does it say about Elawady's specific claim?: Partly supports phytate concern
Do the results apply to Germany and Europe?: High
What can explicitly not be concluded from this study?: Cannot show legumes cause anaemia in mixed diets.

Estimate iron bioavailability factors for diets.

Study design: Narrative review – Review of iron bioavailability data used for dietary reference values
Population: Humans (isotope and intake studies)
Country: Not applicable
Period: Not applicable
Sample size: Not applicable
Inclusion and exclusion criteria: Not reported

Exposure / intervention: Diet composition (phytate, polyphenols, calcium, ascorbic acid, meat)
Comparator: Mixed vs vegetarian diets
Endpoints: Iron absorption
Statistical methods: Not applicable

Results: Iron bioavailability 14-18% for mixed diets and 5-12% for vegetarian diets in subjects with no iron stores; single-meal effects of inhibitors/enhancers larger than in multi-meal studies; iron status has a greater effect than diet composition.
Absolute risks: not reported
Authors' conclusion: Iron status and host factors play a key role; develop bioavailability factors based on diet and subject characteristics.

Not applicable.

Supports mechanism in C-LEG-08.

Same review: multimeal effects modest.

High.

Correct numbers, incomplete context.

Multidimensional assessment
Multidimensional assessment
Authenticity of the source	verified
Methodological quality	moderate
Risk of bias	not assessable
Precision of results	not applicable
Directness	indirect
Reproducibility	replicated
Consistency with the overall evidence	consistent
Regional transferability	high
Adequacy of the interpretation (by the archive)	partly correct but over-interpreted

Contribution of fava to Egyptian anaemia.

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: Phytic acid is the main inhibitor of non-heme iron; 5-12% vs 14-18%.
A. What was actually studied?: Iron bioavailability factors.
B. What did the authors find?: As above; multimeal effects modest; iron status dominant.
C. What conclusions do the authors themselves draw?: Iron status > diet composition.
D. What does the archive derive from it?: Used to show legumes impair iron status.
E. Is this derivation scientifically justified?: Partly: phytate inhibits absorption, but the review stresses modest effects in varied diets and does not single out legumes; the percentages describe whole diets.
Adequacy of the interpretation (by the archive): partly correct but over-interpreted