Effect of a chronic Western diet on the level of phosphatidylcholine species. Hepatic and intestinal PC levels were detected using LC-MS/MS. A: Significantly regulated PC in the small intestine (n = 6). B: Significantly regulated PC in the liver (n = 6). Data are presented as fold change (Western diet versus control) ± SEM. Abbreviations: PC.aa.: phosphatidylcholine diacyl; PC.ae.: phosphatidylcholine acyl-alkyl; lysoPC.a.: lysophosphatidylcholine acyl.