Fish oil reduces cholesterol and arachidonic acid content more efficiently in rats fed diets containing low linoleic acid to saturated fatty acid ratios.
Rats were fed diets containing a high level of saturated fatty acids (hydrogenated beef tallow) versus a high level of linoleic acid (safflower oil) at both low and high levels of fish oil containing 7.5% (w/w) eicosapentaenoic and 2.5% (w/w) docosahexaenoic acids for a period of 28 days. The effect of feeding these diets on the cholesterol content and fatty acid composition of serum and liver lipids was examined. Feeding diets high in fish oil with safflower oil decreased the cholesterol content of rat serum, whereas feeding fish oil had no significant effect on the cholesterol content of serum when fed in combination with saturated fatty acids. The serum cholesterol level was higher in animals fed safflower oil compared to animals fed saturated fat without fish oil. Consumption of fish oil lowered the cholesterol content of liver tissue regardless of the dietary fat fed. Feeding diets containing fish oil reduced the arachidonic acid content of rat serum and liver lipid fractions, the decrease being more pronounced when fish oil was fed in combination with hydrogenated beef tallow than with safflower oil. These results suggest that dietary n-3 fatty acids of fish oil interact with dietary linoleic acid and saturated fatty acids differently to modulate enzymes of cholesterol and fatty acid metabolism.
Garg
M L
ML
Department of Foods and Nutrition, Faculty of Home Economics, University of Alberta, Edmonton, Canada.
Wierzbicki
A A
AA
Thomson
A B
AB
Clandinin
M T
MT
D000818:Animals; D016718:Arachidonic Acid; D001095:Arachidonic Acids / Q000097:blood / Q000378:metabolism*; D001835:Body Weight / Q000187:drug effects; D002784:Cholesterol / Q000097:blood / Q000378:metabolism*; D004041:Dietary Fats / Q000008:administration & dosage / Q000494:pharmacology*; D004281:Docosahexaenoic Acids / Q000008:administration & dosage / Q000494:pharmacology; D004435:Eating / Q000187:drug effects; D015118:Eicosapentaenoic Acid / Q000008:administration & dosage / Q000494:pharmacology; D005227:Fatty Acids / Q000008:administration & dosage / Q000494:pharmacology*; D005395:Fish Oils / Q000008:administration & dosage / Q000494:pharmacology*; D019787:Linoleic Acid; D008041:Linoleic Acids / Q000008:administration & dosage / Q000494:pharmacology*; D050356:Lipid Metabolism; D008055:Lipids / Q000097:blood; D008099:Liver / Q000033:anatomy & histology / Q000187:drug effects / Q000378:metabolism; D008297:Male; D009929:Organ Size / Q000187:drug effects; D051381:Rats; D011919:Rats, Inbred Strains
D001095:Arachidonic Acids; D004041:Dietary Fats; D005227:Fatty Acids; D005395:Fish Oils; D008041:Linoleic Acids; D008055:Lipids; D004281:Docosahexaenoic Acids; D016718:Arachidonic Acid; D002784:Cholesterol; D019787:Linoleic Acid; D015118:Eicosapentaenoic Acid