GPT and atrial fibrillation: In addition, the plasma aspartate aminotransferase (AST) and alanine aminotransferase (ALT) levels in the AF/CO group were significantly elevated by 2.3-fold (73.6 ± 11.7 vs. 22.9 ± 5.1 U/L) and 2.4-fold (50.8 ± 15.1 vs.14.9 ± 4.3 U/L), respectively, over those in their pair-fed mice, which were effectively suppressed by dietary FO administration.