Effects of palm and sunflower oils on serum cholesterol and fatty liver in rats.
Palm oil is a common cooking ingredient used in the commercial food industry as the second largest consumed vegetable oil in the world. Because of its lower cost and highly saturated nature, it usually maintains a solid form at room temperature and is used as a cheap substitute for butter. However, there has been a growing health concern about palm oil because of the link between dietary fats and coronary heart disease. Palm oil contains ∼49% saturated fat, a relatively high concentration compared with other vegetable oils. Consequently, high intakes of saturated fat from palm oil induce a larger increase in plasma concentrations of total cholesterol and low-density lipoproteins. In the present study, we examined the hyperlipidemia of palm oil and the risk of cardiovascular disease (CVD) using a rat model in comparison with sunflower oil with a relatively low level of saturated fat. On in vivo examination using Sprague-Dawley (SD) rats for 22 days, there were no significant differences in serum lipid levels, suggesting that palm oil may not cause hyperlipidemia and elevate CVD risk. However, liver samples obtained from SD rats fed with palm oil showed a lot of large lipid inclusions stained with the Oil Red O working solution, but not much lipid accumulation was observed in rats treated with sunflower oil. In addition, lipid accumulation in the mixed oil group fed the combination of palm and sunflower (1:1) oil was shown to be at an intermediary level between the palm oil group and sunflower oil group. Taken together, these results indicate that palm oil, a highly saturated form of vegetable oil, may induce dysfunction of the liver lipid metabolism before affecting serum lipid levels. On the other hand, sunflower oil, a highly unsaturated vegetable oil, was shown to be well metabolized in liver.
1 Laboratory of Biochemistry and Immunology, College of Veterinary Medicine, Chungbuk National University , Cheongju, Korea.
Ryeo-Eun
RE
Go
Kyung-A
KA
Hwang
Ye-Seul
YS
Kim
Seung-Hee
SH
Kim
Ki-Hoan
KH
Nam
Kyung-Chul
KC
Choi
D000818:Animals; D028023:Arecaceae / Q000737:chemistry*; D002784:Cholesterol / Q000097:blood*; D004041:Dietary Fats / Q000378:metabolism / Q000494:pharmacology; D005227:Fatty Acids / Q000378:metabolism / Q000494:pharmacology*; D005234:Fatty Liver / Q000209:etiology* / Q000378:metabolism; D006368:Helianthus / Q000737:chemistry*; D008099:Liver / Q000187:drug effects* / Q000378:metabolism; D008297:Male; D000073878:Palm Oil; D010938:Plant Oils / Q000378:metabolism / Q000494:pharmacology*; D017207:Rats, Sprague-Dawley; D000074242:Sunflower Oil
D004041:Dietary Fats; D005227:Fatty Acids; D010938:Plant Oils; D000074242:Sunflower Oil; D000073878:Palm Oil; D002784:Cholesterol
cholesterol; fatty liver; palm oil; sunflower oil; triglyceride