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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Lipaemia and liver composition in pregnant rats consuming olive oil and olive oil used for frying.

The effect of the consumption of unused olive oil (polar content, 2%; oleic acid, 78.9 mg/100 mg oil, and linoleic acid 7 mg/100 mg oil) and olive oil used discontinuously for frying potatoes 15 times (polar content, 9%; oleic acid, 75.8 mg/100 mg oil and linoleic acid 6.2 mg/100 mg oil) was studied in pregnant rats with the aim of better understanding the relationship between the consumption of fat used in frying and lipid metabolism during periods of intense anabolism. Trials were performed in pregnant Wistar rats, divided into 2 groups and fed isocaloric diets in which the fat content (15% wt/wt) consisted of unused olive oil (P1) or oil previously used for frying (P2), and the results were compared with those of nonpregnant rats fed unused olive oil ( NP1) and olive oil used for frying ( NP2). Pregnancy increased (p < 0.01) food intake, body weight, weight gain, and food efficiency ratio (P2 vs NP2 and P1 vs NP1, respectively), but the treatment of oil included in the diets did not alter these parameters. Gestation significantly increased the serum triglyceride (TG) (p < 0.01) and total cholesterol (TC) (p < 0.05) concentrations and diminished that of phospholipids (PH) (p < 0.01). A significant effect of the type of oil consumed and a pregnancy x oil interaction on Tg and PH levels was observed. The weight of the liver and its fat content increased significantly (p < 0.05) as a result of pregnancy. Liver TC, TG, and PH increased (approximately 3 times the original values) during gestation, but no significant differences due to the intake of used or unused oil (P2 vs P1) were observed. The results indicate that the consumption of moderately altered olive oil, as the sole source of fat, does not alter the effect of pregnancy on the mothers' weight gain, lipaemia, and hepatic fat composition to any important degree.[1]


  1. Lipaemia and liver composition in pregnant rats consuming olive oil and olive oil used for frying. López-Varela, S., Sánchez-Muniz, F.J. Zeitschrift für Ernährungswissenschaft. (1997) [Pubmed]
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