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Polish Journal of Food and Nutrition Sciences

The Journal of Institute of Animal Reproduction and Food Research of Polish Academy of Sciences in Olsztyn

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Potential Health Implications of the Consumption of Thermally-Oxidized Cooking Oils – a Review

Ayodeji Osmund Falade
  • Corresponding author
  • SAMRC Microbial Water Quality Monitoring Centre, University of Fort Hare, Private Bag X1314, Alice, 5700, Eastern Cape, South Africa
  • Applied and Environmental Microbiology Research Group (AEMREG), Department of Biochemistry and Microbiology, University of Fort Hare, Private Bag X1314, Alice, 5700 Eastern Cape, South Africa
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  • Other articles by this author:
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/ Ganiyu Oboh
  • Functional Foods and Nutraceuticals Unit, Department of Biochemistry, Federal University of Technology, P. M.B. 704, Akure, 340252, Nigeria
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/ Anthony Ifeanyi Okoh
  • SAMRC Microbial Water Quality Monitoring Centre, University of Fort Hare, Private Bag X1314, Alice, 5700, Eastern Cape, South Africa
  • Applied and Environmental Microbiology Research Group (AEMREG), Department of Biochemistry and Microbiology, University of Fort Hare, Private Bag X1314, Alice, 5700 Eastern Cape, South Africa
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Published Online: 2016-11-30 | DOI: https://doi.org/10.1515/pjfns-2016-0028


Cooking oils are an integral part of a human diet as they are used in almost all types of culinary practices. They serve as sources of lipids with a significant nutritive value and health benefits which can be attributed to their fatty acid compositions and biological antioxidants. However, cooking oils are usually subjected to thermal oxidation which occurs when fresh cooking oil is heated at high temperatures during various food preparations. Repeated use of cooking oils in the commercial food industry is also common to maximize profit. Thermal oxidation of edible oils had since attracted great attention of nutritionist and researchers given the deteriorative effect such as generation of very cytotoxic compounds, loss of carotenoid, phenolics and vitamins thus reducing the overall antioxidant properties of the oils. Furthermore, several in vivo studies had suggested that consumption of thermally-oxidized cooking oils might not be healthy as it might negatively influence the lipid profile (increased low density lipoprotein (LDL), decreased high density lipoprotein (HDL) and elevated cholesterol level), haematological system (alteration in concentration of heamoglobin (Hb), packed cell volume (PCV), white blood cell (WBC) count, neutrophil and lymphocyte counts), kidney function, and induce lipid peroxidation and oxidative stress which have been associated with the pathogenesis of various degenerative diseases. Therefore, thermal oxidation seems not to provide any health benefit, as it deteriorates cooking oils and the consumption of the oils may predispose consumers to various disease conditions that may ensue from free radical generation, thereby having deleterious effect on human health.

Keywords: thermal oxidation; cooking oils; antioxidant properties; health concerns


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About the article

Received: 2016-03-17

Revised: 2016-06-03

Accepted: 2016-07-15

Published Online: 2016-11-30

Published in Print: 2017-06-01

Citation Information: Polish Journal of Food and Nutrition Sciences, ISSN (Online) 2083-6007, DOI: https://doi.org/10.1515/pjfns-2016-0028.

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© 2017 Ayodeji Osmund Falade et al., published by De Gruyter Open. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. BY-NC-ND 3.0

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