Higher antioxidant concentrations, and less cadmium and pesticide residues, in organically grown crops: a systematic literature review and meta-analysis
Baranski M et al. (2014) British Journal of Nutrition 06/2014; DOI: 10.1017/S0007114514001366
Demand for organic foods is partially driven by consumer perceptions that they are more nutritious. However, scientific opinion is divided on whether there are significant nutritional differences between organic and non-organic foods, and two recent reviews concluded that there are no differences. Here we report results of meta-analyses based on 343 peer-reviewed publications that indicate statistically significant, meaningful differences in composition between organic and non-organic crops/crop based foods. Most importantly, concentrations of a range of antioxidants such as polyphenolics were found to be substantially higher in organic crops/crop based foods, with levels of phenolic acids, flavanones, stilbenes, flavones, flavonols and anthocyanines being an estimated 19 (95% CI 5, 33), 69 (95% CI 13, 125), 28 (95% CI 12, 44), 26 (95% CI 3, 48), 50 (95% CI 28, 72) and 51 (95% CI 17, 86) % higher respectively.