(A) Multidimensional scaling (MDS) plot of bacterial community structure of faecal samples from different feeding regimes; (B) Effect of supplementation of diet (C or H) with Caulerpa lentillifera on the ratio of Firmicutes and Bacteroidetes (F/B) abundances in rat faecal samples. Statistical analysis performed using ANOVA with Tukey’s post hoc test for multiple comparisons, * p < 0.05; and (C) Taxonomic profiles of bacterial communities shown at the family level of all faecal samples. C, corn starch diet-fed rats; CCL, corn starch diet-fed rats supplemented with Caulerpa lentillifera; H, high-carbohydrate, high-fat diet-fed rats; HCL, high-carbohydrate, high-fat diet-fed rats supplemented with Caulerpa lentillifera.