However, from the analysis, we proposed that the probiotics supplementation, especially Lactobacillus and Bifidobacterium, may be beneficial in the patients with morbid obesity undergoing bariatric surgery, for 9 studies used either Lactobacillus or Bifidobacterium except the study of Kazzi and Han et al. And the durations of probiotics supplementation mostly were 3 months postoperatively except the duration of Han and Woodard et al. were 6 months (Results related with serum TNF-a and IL-6 levels in Sherf-Dagan were also 6 months) [31, 32]. Here, IL6 is linked to morbid obesity.