Patients will be randomized into 2 groups:~G1: Patients undergoing sleeve gastrectomy as bariatric procedure and receiving pre- and postoperative probiotics~G2: Patients undergoing sleeve gastrectomy as bariatric procedure and not receiving pre- or postoperative probiotics~Preoperative probiotics scheme include:~saccharomyces boulardii ntc 5375 + enterococcus faecium UBEF-41 + lactobacillus acidophilus LA 14 during 15 days (between 6th and 4th weeks before surgery)~Bifidobacterium lactis BL 04 + Bifidobacterium breve BB 03 + Bifidobacterium bifidum BB 06 + Bifidobacterium longum BL 05 during 15 days (between 4th and 2nd weeks before surgery)~lactobacillus rhamnosus LR 32 + lactobacillus rhamnosus HN001 + lactobacillus acidophillus LA 14 during 15 days (between 2nd week and the day before surgery)~Postoperative probiotics scheme include:~saccharomyces boulardii ntc 5375 + enterococcus faecium UBEF-41 + lactobacillus acidophilus LA 14 during 15 days (between 1st and 3rd weeks after surgery)~Lactobacillus rhamnosus LR 32 + Bifidobacterium lactis BL 04 + Bifidobacterium longum BL 05 + lactobacillus salivarius LS 33 + lactobacillus acidophilus LA 14 + bifidobacterium bifidum BGN 4 during 4 months (between 4th and 20th weeks after surgery.~Both groups will receive the same nutritional recommendations.~1 year after surgery, weight los will be assessed as primary outcome. Secondary outcomes will include daibetes mellitus remission and dyslipidemia remission.~Weight loss will be assessed 1 year after surgery
Patients will be randomized into 2 groups:~G1: Patients undergoing sleeve gastrectomy as bariatric procedure and receiving pre- and postoperative probiotics~G2: Patients undergoing sleeve gastrectomy as bariatric procedure and not receiving pre- or postoperative probiotics~Weight loss will be assessed 1 year after surgery