Influence of dietary fat on plasma fatty acid composition in rats
1992
Rueda, P. | Pharm, B. | Lopez-Frias, M. | Llopis, J. | Mataix, F.J. | Urbano, G.
We studied the influence of dietary fat on the plasma fatty acid composition in male Wistar rats fed four experimental semisynthetic, isocaloric diets containing different qualities of fat (olive oil, butter, medium chain triglycerides + corn oil 1:1, olive oil + butter + corn oil + medium chain triglycerides 1:1:1:1). The animals were studied from 21 days of age until a body weight of approximately 180 g (60 days) was reached. Under our experimental conditions, feeding with the different diets failed to modify the saturation index, calculated as the sum of the percentages of saturated fatty acids. In contrast, plasma levels of mono- and omega 6 polyunsaturated fatty acids (sum of linoleic acid and its derivatives) were clearly influenced by the dietary content of these compounds. However, the relationship between percentage dietary plasma linoleic acid and percentage plasma omega 6 polyunsaturated fatty acids was not directly proportional. Diets containing lower proportions of linoleic acid (butter and olive oil) led to significantly higher values (p < 0.05 and p < 0.02 respectively) of omega(3) polyunsaturated acids (sum of linolenic acid and its derivatives) than diets with a larger proportion of this compound (medium chain triglycerides + corn oil, and olive oil + butter + corn oil + medium chain triglycerides).
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