Assessment of multi-strain probiotics in regulating diet-induced obesity in Balb/c mice model

This study investigated the efficacy of a novel multi-strain probiotic (MSP), composed of Limosilactobacillus fermentum BAB 7912, Bacillus rugosus PIC5CR, and Bacillus rugosus PIB9CR, in preventing and reverting diet-induced obesity in Balb/c male mice.

This study used 8-week-old Balb/c mice. A total of 40 mice were divided into five groups namely control negative (CN), control with obesity (CO), and three treatment groups: microbial consortium treated (MCT), Healthy control 1 (HC1), and Healthy control 2 (HC2). Obesity was induced using a high-fat diet. MSP formulation developed indigenously as part of previous study, was fed to Balb/c mice at different time intervals to study its preventive and ameliorative potential. Animals were dissected for the collection of blood as well as various organs to study the effect of MSP feeding on obesity status. Results were validated using histopathological and metagenomic data.

The CN and other treatment groups gained significant weight at the end of 6 weeks, while no significant weight gain was observed among HC1 group animals that were fed with HFD and MSP together. This highlights the preventive effect of continuous MSP feeding in the HC1 animal group. Initial liver histopathology in the HC1 group revealed enlarged hepatocytes and fat droplets. By week 9, the MCT group, which received MSP with a basal diet, showed liver recovery towards normal, accompanied by body weight improvement from 28.02 ± 0.7 g to 26.18 ± 0.96 g. Metagenomic analysis revealed that MSP treatment increased the relative abundance of health-promoting bacteria, notably Lactobacillaceae (specifically Lactobacillus).

Findings indicated that continuous consumption of MSP contributes significantly in prevention of obesity and associated metabolic disorders. Future studies are needed to explore the mechanisms underlying these effects and to evaluate the potential of MSP for human health.