A High-Fat Diet Rich in Oleic Acid, but Not in Saturated Fat, Lowers Certain Healthy Fat Levels in Mouse Livers

A high saturated fatty acid diet is associated with a 40% reduction in the conversion of α-linolenic acid (ALA) to long chain n-3 fatty acids in mice.

• Mice fed a high monounsaturated fatty acid diet showed a 35% reduction in eicosapentaenoic acid (EPA) compared to those on high saturated fatty acids or control diets.
• The content of ALA remained constant across all diets, but its levels were lower in the neutral lipid fraction of high monounsaturated fatty acid-fed mice.
• Higher docosahexaenoic acid (DHA) levels were observed in mice consuming a high saturated fatty acid diet.
• Expression of enzymes involved in fatty acid metabolism was elevated in high monounsaturated fatty acid-fed mice and reduced in high saturated fatty acid-fed mice.
• These findings suggest distinct metabolic pathways for ALA and linoleic acid (LNA) in the liver, influenced by the type of dietary fat.

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