Summary
This critical review challenges the reliability of reported historical declines in mineral nutrients of vegetables, fruits and grains by examining methodological confounders in comparative food composition studies. The author demonstrates that apparent declines largely reflect changes in data sources, varieties, geographic origin, ripeness, sampling and analytical methods rather than soil depletion. Modern high-yield crop varieties show lower mineral concentrations relative to carbohydrate content (dilution effect), but absolute changes are small compared to natural variation ranges, and soil mineral content has not declined under intensive cultivation with fertiliser treatment.
Regional applicability
Findings are globally relevant as they address methodological issues in food composition databases used internationally, including in the United Kingdom. The review's conclusions on soil mineral status and the dilution effect apply to UK intensive agricultural systems with fertiliser use, though UK-specific soil and crop variety data would strengthen local applicability.
Key measures
Mineral nutrient concentrations (copper, and other minerals) in vegetables, fruits and grains; natural variation ranges; comparison of historical versus contemporary food composition data; soil mineral content; dilution effects in high-yield varieties
Outcomes reported
Critical review examining reports of historical declines in mineral nutrients in vegetables, fruits and grains, evaluating methodological reliability and the role of crop variety breeding and yield increases. The study contextualises apparent nutrient declines within natural variation ranges and soil mineral content changes.
Topic tags
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