Research progress of probiotics regulating intestinal micro-ecological environment in obese patients after bariatric surgery.

Bariatric surgery may cause intestinal microecological environment imbalance due to changes in gastrointestinal anatomy. Some patients may have complications, even regain weight. Probiotics can act on intestinal mucosa, epithelium and gut-associated lymphoid tissue to improve the intestinal microecological environment of obese patients after bariatric surgery. Probiotics can promote the production of intestinal antibacterial substances, bind specifically to receptors, decrease intestinal pH value, reduce the inflammatory factors, thus helping patients lose weight and lower blood sugar levels after bariatric surgery. Probiotics can produce lactic acid, acetic acid, lactase, etc., inhibit the growth of harmful bacteria, improve gastrointestinal symptoms of patients after bariatric surgery. Probiotics can activate the AMP-activated protein kinase signaling pathway, improve lipid metabolism, and promote the recovery of symptom indicators of nonalcoholic fatty liver disease after bariatric surgery. Probiotics can regulate the release of neurotransmitters or metabolites by the microbiota through the gut-brain axis to affect brain activity and behavior, thus helping patients improve bad mood after bariatric surgery. This article describes the intestinal microecological environment of obese patients and the change mechanism after bariatric surgery and summarizes the effects and possible mechanisms of probiotics in improving the intestinal microecological environment of obese patients after bariatric surgery, in order to provide references for promoting the clinical application of probiotics.