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Lactulose to mannitol ratios represented before (pre) and after (post) eight weeks of a very-low-calorie ketogenic diet (VLCKD). Lac to Man ratio = Lactulose to Mannitol ratio. Statistical analysis: Fisher’s exact test with a significant difference set at p < 0.05. The dotted red line indicates the cut-off value for altered small intestinal permeability (Lac to Man ratio ≥ 0.03).
