Reusing cooking oil in food preparation, especially during deep-frying, is a
common practice to save costs. Repeated heating of the oil accelerates oxidative
degradation of lipids, forming hazardous reactive oxygen species and depleting
the natural antioxidant contents of the cooking oil. Long-term ingestion of foods
prepared using reheated oil could severely compromise one’s antioxidant
defense network, leading to pathologies such as hypertension, diabetes and
vascular inflammation. The detrimental effects of reheated oil consumption
extend beyond mere oxidative assault to cellular antioxidant shield. In this
review, we have examined the experimental and clinical effects related to the
intake of reheated oil on antioxidant contents, membrane lipid peroxidation and
endothelial function. Understanding the mechanisms underlying the pathology
associated with intake of repeatedly heated oil will help to set a reference for
assessing the safety of cooking oil. Finally, considering the potential hazard of
repeatedly heating oil, this article aims to further increase awareness of the
general public regarding the health risks associated with these oils.
Reusing cooking oil in food preparation, especially during deep-frying, is acommon practice to save costs. Repeated heating of the oil accelerates oxidativedegradation of lipids, forming hazardous reactive oxygen species and depletingthe natural antioxidant contents of the cooking oil. Long-term ingestion of foodsprepared using reheated oil could severely compromise one’s antioxidantdefense network, leading to pathologies such as hypertension, diabetes andvascular inflammation. The detrimental effects of reheated oil consumptionextend beyond mere oxidative assault to cellular antioxidant shield. In thisreview, we have examined the experimental and clinical effects related to theintake of reheated oil on antioxidant contents, membrane lipid peroxidation andendothelial function. Understanding the mechanisms underlying the pathologyassociated with intake of repeatedly heated oil will help to set a reference forassessing the safety of cooking oil. Finally, considering the potential hazard ofrepeatedly heating oil, this article aims to further increase awareness of thegeneral public regarding the health risks associated with these oils.
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