A comparison of organically and conventionally grown foods—results of a review of the relevant literature

Summary

This 1997 narrative review synthesised evidence from over 150 studies comparing the quality of organically and conventionally produced foods across diverse categories including cereals, vegetables, fruits, animal products, and processed foods. The authors evaluated physico-chemical analyses, pesticide residue measurements, contaminant levels, and sensory assessments, acknowledging substantial methodological heterogeneity that complicated direct comparison. The review identified some quality differences between production systems, though the authors emphasised that factors beyond farming method significantly influenced food quality outcomes.

Regional applicability

This international review included data from multiple regions and would be applicable to United Kingdom food systems; however, as a 1997 publication predating subsequent regulatory harmonisation, significant changes in both organic and conventional production standards, pesticide regulations, and analytical methods mean that findings require contextualisation within contemporary UK agricultural and food safety frameworks.

Key measures

Concentrations of desirable and undesirable ingredients, pesticide residues, contaminants, sensory analysis parameters, animal feed trial outcomes, and nutritional biomarkers in humans

Outcomes reported

The review synthesised results from over 150 investigations comparing food quality across multiple product categories, assessing physico-chemical composition, pesticide residues, contaminants, sensory properties, and animal feeding trials. Despite methodological heterogeneity, some differences in quality between organic and conventional farming systems were identified.

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