Summary
This systematic review of 120 studies examined whether organically produced foods contain higher micronutrient levels than conventionally produced equivalents. Whilst some studies reported elevated vitamin C, vitamin E, magnesium, iron, and polyphenol content in organic produce, and enhanced antioxidants or fat-soluble vitamins in certain animal products, the overall evidence was inconsistent. The authors conclude that soil fertility, fertiliser type, and climate conditions may influence micronutrient content as substantially as farming method, and that existing literature does not support a systematic nutritional advantage for organic production.
Regional applicability
The findings are globally applicable, drawing on international literature. The conclusions align with mixed evidence from United Kingdom and European studies on organic versus conventional food composition, and may inform UK consumer policy and marketing claims about organic food nutrition.
Key measures
Vitamin C, vitamin E, magnesium, iron, polyphenols, antioxidants, and fat-soluble vitamins in plant and animal products
Outcomes reported
The review compared micronutrient content (vitamins, minerals, polyphenols, antioxidants) in plant- and animal-based foods from organic and conventional production systems. The analysis synthesised findings from 120 peer-reviewed studies to assess whether organic production consistently yields higher nutrient density than conventional agriculture.
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