Summary
This systematic review by Dangour et al., published in the American Journal of Clinical Nutrition in 2009, synthesised available evidence on the nutritional composition of organically versus conventionally produced foods. The authors concluded that there was no strong evidence to support the claim that organic foods are significantly more nutritious than conventional equivalents, with the majority of reported differences not reaching statistical or nutritional significance. The review was methodologically rigorous in its inclusion criteria and represents a widely cited reference point in the debate over organic food quality.
UK applicability
The review drew on international literature and included UK-origin studies, making its conclusions broadly applicable to UK consumers and policy discussions. It has been influential in informing UK Food Standards Agency guidance on organic food claims, though subsequent research has continued to contest some of its conclusions.
Key measures
Nutrient content (nitrogen, phosphorus, potassium, magnesium, calcium, vitamin C, phenolic compounds); frequency and direction of significant differences between organic and conventional foods
Outcomes reported
The review assessed differences in nutrient content between organically and conventionally produced foods across a range of food types. It reported on concentrations of macro- and micronutrients, including nitrogen, phosphorus, and selected vitamins and minerals.
Topic tags
Dig deeper with Pulse AI.
Pulse AI has read the whole catalogue. Ask about this record, its theme, or how the findings apply to UK farming and policy — every answer cites the underlying studies.