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Berberine and curcumin, used as food additives or food supplements, possess interesting anti-inflammatory and antioxidant properties. We tested the potential protective effect of both phytochemicals in genetically obese mice and we determined whether these effects can be related to the modulation of gut functions and microbiota.  Ob/ob  mice were fed a standard diet supplemented with or without 0.1% berberine and/or 0.3% curcumin for 4 weeks. By using targeted qPCR, we found that cecal content of  Bifidobacterium  spp. and  Akkermansia  spp. increased mainly upon berberine supplementation. Genes involved in innate immunity ( Pla2g2a ), mucus production ( Muc2 ) and satietogenic peptide production ( Gcg  and  Pyy)  were upregulated in the colon of mice treated with both phytochemicals. Berberine supplementation alone reduced food intake, body weight gain, hypertriglyceridemia and hepatic inflammatory and oxidative stress markers, thus lessening hepatic injury. The increase in  Bifidobacterium  spp. and  Akkermansia  spp. was correlated with the improvement of gut barrier function and with the improvement of hepatic inflammatory and oxidative stresses in obese mice. These data support the fact that non-carbohydrate phytochemicals may modulate the gut microbiota in obesity and related gut and hepatic alterations.

Prebiotic Effect of Berberine and Curcumin Is Associated with the Improvement of Obesity in Mice