Summary
Published in Nutrition Today, this paper by Charles Benbrook investigates the 'dilution effect' — the phenomenon whereby higher-yielding crop varieties tend to contain lower concentrations of essential nutrients per unit of food produced. Drawing on existing datasets and the broader agronomic literature, Benbrook argues that the prioritisation of yield in crop breeding and agricultural intensification may have contributed to measurable declines in the nutritional quality of staple foods. The paper is likely a narrative or analytical review synthesising evidence from multiple crop systems and decades of agricultural change.
UK applicability
Whilst the paper is international in scope, its findings are broadly applicable to the UK, where high-yielding cereal and vegetable varieties dominate commercial production; the dilution effect is relevant to UK policy debates around food quality, soil health, and the nutritional implications of intensification.
Key measures
Nutrient concentration (minerals, vitamins, protein mg/kg or %); crop yield (t/ha); dilution effect estimates
Outcomes reported
The paper examines how increases in crop yields over recent decades may be associated with reductions in the concentration of key nutrients in food crops. It likely reports on trends in mineral, vitamin, and protein content relative to yield improvements across major crop types.
Topic tags
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