Zoltan Szabo, Tamas Marosvölgyi, Eva Szabo, Viktor Koczka, Zsofia Verzar, Maria Figler, Tamas Decsi

Several polyunsaturated fatty acids are considered to have beneficial health effects, while saturated fatty acids and industrial fatty acids (TFAs) are linked to negative health consequences. Given the increased formation of TFAs during heating, many studies already investigated compositional changes in oils after prolonged heating or at extremely high temperatures. In contrast, our aim was to measure changes in fatty acid composition and in some health-related indices in edible oils after short-time heating that resembles the conventional household use. Potatoes were fried in palm, rapeseed, soybean, sunflower and extra virgin olive oils at 180 °C for 5 min, and samples were collected from fresh oils and after 1, 5 and 10 consecutive heating sequences. Regardless of the type of oil, the highest linoleic acid and alpha-linolenic acid values were measured in the fresh samples, whereas significantly lower values were detected in almost all samples following the heating sequences. In contrast, the lowest levels of TFAs were detected in the fresh oils, while their values significantly increased in almost all samples during heating. Indices of atherogenicity and thrombogenicity were also significantly higher in these oils after heating. The present data indicate that prolonged or repeated heating of vegetable oils should be avoided; however, the type of oil has a greater effect on the changes of health-related indices than the number of heating sequences.

J Agric Food Chem. 2004 Aug 11;52(16):5290-6 [PMID: 15291510]

Nutrients. 2015 Oct 06;7(10):8424-30 [PMID: 26457715]

J Food Sci Technol. 2011 Oct;48(5):534-41 [PMID: 23572785]

Am J Clin Nutr. 1991 Sep;54(3):438-63 [PMID: 1908631]

Meat Sci. 2010 Apr;84(4):769-77 [PMID: 20374855]

J Food Sci. 2010 Mar;75(2):H62-7 [PMID: 20492236]

Foods. 2021 Feb 13;10(2): [PMID: 33668614]

Am J Clin Nutr. 2015 Dec;102(6):1339-46 [PMID: 26561632]

Food Sci Nutr. 2013 Jul;1(4):292-7 [PMID: 24804033]

Food Chem. 2016 Dec 1;212:663-70 [PMID: 27374582]

Food Nutr Res. 2008;52: [PMID: 19109659]

Metabolism. 2011 Jul;60(7):906-13 [PMID: 21397284]

J Agric Food Chem. 2012 Oct 24;60(42):10709-13 [PMID: 23025355]

J Agric Food Chem. 2014 Oct 22;62(42):10357-67 [PMID: 25264922]

Chem Phys Lipids. 2010 Sep;163(7):741-5 [PMID: 20599852]

Lipids. 1976 Apr;11(4):272-80 [PMID: 1263771]

J Food Sci Technol. 2019 Jan;56(1):290-301 [PMID: 30728571]

J Food Sci. 2007 Jun;72(5):R77-86 [PMID: 17995742]

Lancet. 1993 Mar 6;341(8845):581-5 [PMID: 8094827]

Br J Nutr. 2015 Apr;113 Suppl 2:S49-57 [PMID: 26148922]

J Agric Food Chem. 2004 Jun 2;52(11):3422-8 [PMID: 15161209]

Eur J Clin Nutr. 2009 May;63 Suppl 2:S5-21 [PMID: 19424218]

N Engl J Med. 2006 Apr 13;354(15):1601-13 [PMID: 16611951]

Toxicol Res. 2015 Sep;31(3):307-12 [PMID: 26483890]

Adv Nutr. 2020 May 1;11(3):697-708 [PMID: 31782488]

Int J Mol Sci. 2020 Aug 08;21(16): [PMID: 32784511]

Lancet. 1991 Oct 19;338(8773):985-92 [PMID: 1681350]

Food Chem Toxicol. 2010 Oct;48(10):2972-9 [PMID: 20678538]

Food Sci Technol Int. 2013 Feb;19(1):11-23 [PMID: 23239760]

J Food Sci Technol. 2015 May;52(5):2646-56 [PMID: 25892762]

Crit Rev Food Sci Nutr. 2020;60(9):1496-1514 [PMID: 30740987]

BMJ. 2019 Jul 3;366:l4137 [PMID: 31270106]

Meat Sci. 2021 Nov;181:108612 [PMID: 34171787]

Am J Clin Nutr. 1977 Jul;30(7):1009-17 [PMID: 879068]

N Engl J Med. 1999 Jun 24;340(25):1994-8 [PMID: 10379026]

Brain Res. 2008 Oct 27;1237:35-43 [PMID: 18789910]

Nutrients. 2012 Sep;4(9):1338-57 [PMID: 23112921]

Diabetologia. 2004 Jun;47(6):1016-9 [PMID: 15168020]

Circulation. 2019 Sep 10;140(11):e563-e595 [PMID: 30879339]

Toxicol Sci. 2015 May;145(1):5-15 [PMID: 25911656]

Eur J Clin Nutr. 1997 Jan;51(1):30-2 [PMID: 9023464]

Atherosclerosis. 2009 Aug;205(2):458-65 [PMID: 19345947]

Z Ernahrungswiss. 1982 Sep;21(3):191-201 [PMID: 6293212]

Antioxidants (Basel). 2021 Jul 09;10(7): [PMID: 34356334]

Int J Food Sci Nutr. 2014 May;65(3):306-10 [PMID: 24575785]

Lipids. 1970 Jan;5(1):85-9 [PMID: 4244732]

J Oleo Sci. 2020 Mar 1;69(3):185-190 [PMID: 32051358]

N Engl J Med. 1990 Aug 16;323(7):439-45 [PMID: 2374566]

BMJ. 2015 Aug 11;351:h3978 [PMID: 26268692]

Open Life Sci. 2020 Aug 24;15(1):606-618 [PMID: 33817249]

J Dairy Sci. 2014 Sep;97(9):5657-67 [PMID: 24996268]

J Food Sci. 2012 Jan;77(1):E32-6 [PMID: 22260106]

Food Sci Nutr. 2020 Aug 02;8(9):4814-4821 [PMID: 32994943]

Z Ernahrungswiss. 1985 Jun;24(2):120-32 [PMID: 4049952]

Am J Clin Nutr. 1991 Feb;53(2):474-82 [PMID: 1989415]

Food Chem. 2012 May 1;132(1):439-46 [PMID: 26434313]

Environ Sci Pollut Res Int. 2021 Mar 24;: [PMID: 33761072]

Nutr Hosp. 2015 Sep 01;32(3):1289-99 [PMID: 26319852]

Am J Epidemiol. 1997 May 15;145(10):876-87 [PMID: 9149659]

Food Chem. 2017 Oct 15;233:77-84 [PMID: 28530614]

Crit Rev Food Sci Nutr. 2019;59(3):488-505 [PMID: 28925728]

Am J Clin Nutr. 2013 Apr;97(4):854-61 [PMID: 23407305]

J Agric Food Chem. 2018 Apr 4;66(13):3514-3523 [PMID: 29526090]

Food Res Int. 2019 Aug;122:318-329 [PMID: 31229085]

J Food Sci Technol. 2017 Jul;54(8):2224-2229 [PMID: 28740278]

Adv Nutr. 2012 Jan;3(1):1-7 [PMID: 22332096]

J Food Sci Technol. 2020 Dec;57(12):4716-4725 [PMID: 33087982]

Food Addit Contam Part A Chem Anal Control Expo Risk Assess. 2017 Sep;34(9):1596-1605 [PMID: 28590158]

Food Chem Toxicol. 2013 Oct;60:277-85 [PMID: 23900006]

Asia Pac J Clin Nutr. 2007;16 Suppl 1:407-11 [PMID: 17392140]

Annu Rev Nutr. 2004;24:597-615 [PMID: 15189133]