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Higher antioxidant and lower cadmium concentrations and lower incidence of pesticide residues in organically grown crops: a systematic literature review and meta-analyses

Published online by Cambridge University Press:  15 July 2014

Marcin Barański
Affiliation:
School of Agriculture, Food and Rural Development, Newcastle University, Nafferton Farm, Stocksfield, Northumberland, NE43 7XD, UK
Dominika Średnicka-Tober
Affiliation:
School of Agriculture, Food and Rural Development, Newcastle University, Nafferton Farm, Stocksfield, Northumberland, NE43 7XD, UK
Nikolaos Volakakis
Affiliation:
School of Agriculture, Food and Rural Development, Newcastle University, Nafferton Farm, Stocksfield, Northumberland, NE43 7XD, UK
Chris Seal
Affiliation:
Human Nutrition Research Centre, School of Agriculture, Food and Rural Development, Newcastle University, Agriculture Building, Kings Road, Newcastle upon TyneNE1 7RU, UK
Roy Sanderson
Affiliation:
School of Biology, Newcastle University, Ridley Building, Newcastle upon TyneNE1 7RU, UK
Gavin B. Stewart
Affiliation:
School of Agriculture, Food and Rural Development, Newcastle University, Nafferton Farm, Stocksfield, Northumberland, NE43 7XD, UK
Charles Benbrook
Affiliation:
Center for Sustaining Agriculture and Natural Resources, Washington State University, Pullman, WA, USA
Bruno Biavati
Affiliation:
Department of Agricultural Sciences, School of Agriculture and Veterinary Medicine, University of Bologna, Viale Fanin 42, 40127Bologna, Italy
Emilia Markellou
Affiliation:
Department of Pesticide Control and Phytopharmacy, Benaki Phytopathological Institute, GR 14561 Kifissia, Athens, Greece
Charilaos Giotis
Affiliation:
Department of Organic Farming and Food Technology, Technological Educational Institute of Ionian Islands, Iosif Momferatou & Ilia Miniati PC28100, Argostoli, Cephalonia, Greece
Joanna Gromadzka-Ostrowska
Affiliation:
Faculty of Human Nutrition and Consumer Sciences, Warsaw University of Life Sciences, Nowoursynowska 159c, 02-776Warsaw, Poland
Ewa Rembiałkowska
Affiliation:
Faculty of Human Nutrition and Consumer Sciences, Warsaw University of Life Sciences, Nowoursynowska 159c, 02-776Warsaw, Poland
Krystyna Skwarło-Sońta
Affiliation:
Department of Animal Physiology, Faculty of Biology, University of Warsaw, Miecznikowa 1, 02-096Warsaw, Poland
Raija Tahvonen
Affiliation:
Biotechnology and Food Research, MTT Agrifood Research Finland, FI-31600Jokioinen, Finland
Dagmar Janovská
Affiliation:
Department of Gene Bank, Crop Research Institute (CRI), Drnovská 507/73, 161 06 Praha 6 –Ruzyně, Czech Republic
Urs Niggli
Affiliation:
Research Institute of Organic Agriculture (FiBL), Ackerstrasse 113, CH-5070Frick, Switzerland
Philippe Nicot
Affiliation:
INRA, UR407 Pathologie végétale, 67 allée des chênes, F-84143Montfavet Cedex, France
Carlo Leifert*
Affiliation:
School of Agriculture, Food and Rural Development, Newcastle University, Nafferton Farm, Stocksfield, Northumberland, NE43 7XD, UK
*
*Corresponding author: Professor C. Leifert, fax +44 1661 831 006, email carlo.leifert@newcastle.ac.uk
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Abstract

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Demand for organic foods is partially driven by consumers' 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 have concluded that there are no differences. In the present study, we carried out meta-analyses based on 343 peer-reviewed publications that indicate statistically significant and meaningful differences in composition between organic and non-organic crops/crop-based foods. Most importantly, the concentrations of a range of antioxidants such as polyphenolics were found to be substantially higher in organic crops/crop-based foods, with those of phenolic acids, flavanones, stilbenes, flavones, flavonols and anthocyanins 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. Many of these compounds have previously been linked to a reduced risk of chronic diseases, including CVD and neurodegenerative diseases and certain cancers, in dietary intervention and epidemiological studies. Additionally, the frequency of occurrence of pesticide residues was found to be four times higher in conventional crops, which also contained significantly higher concentrations of the toxic metal Cd. Significant differences were also detected for some other (e.g. minerals and vitamins) compounds. There is evidence that higher antioxidant concentrations and lower Cd concentrations are linked to specific agronomic practices (e.g. non-use of mineral N and P fertilisers, respectively) prescribed in organic farming systems. In conclusion, organic crops, on average, have higher concentrations of antioxidants, lower concentrations of Cd and a lower incidence of pesticide residues than the non-organic comparators across regions and production seasons.

Type
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Creative Commons
Creative Common License - CCCreative Common License - BY
The online version of this article is published within an Open Access environment subject to the conditions of the Creative Commons Attribution licence http://creativecommons.org/licenses/by/3.0/
Copyright
Copyright © The Authors 2014
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Higher antioxidant and lower cadmium concentrations and lower incidence of pesticide residues in organically grown crops: a systematic literature review and meta-analyses
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Higher antioxidant and lower cadmium concentrations and lower incidence of pesticide residues in organically grown crops: a systematic literature review and meta-analyses
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Higher antioxidant and lower cadmium concentrations and lower incidence of pesticide residues in organically grown crops: a systematic literature review and meta-analyses
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