Obese patients have a high level of intestinal microflora imbalance, with serious consequences such as loss of digestive function. Potential mediators of intestinal microbiota are prebiotics, supplements considered safe because they are naturally contained in food and human microbiota. Probiotics are living bacteria which are found in the normal gut microbiota. Synbiotics are combinations of both prebiotics and probiotics. Their use has been studied as a new therapeutic approach for the regulation of intestinal microbiota in various situations of disease, including severe obesity.

This is a double-blind, placebo-controlled, randomized clinical trial to assess the effect of synbiotic supplementation (fructo-oligosaccharide and probiotic - 12 g / day) on body mass index in participants with obesity class III, with follow up of 90 days.

Obesity has been discussed as one of the major diseases that require scientific and technological innovations for its control is obesity and studies indicate that microbiota of obese patients have a high level of intestinal microflora imbalance, with serious consequences such as loss of digestive function and the combination of toxins to protein.

Potential mediators of intestinal microbiota are prebiotics, probiotics and synbiotics, supplements considered safe because they are naturally contained in food and human microbiota. Its use has been studied as a new therapeutic approach for the regulation of intestinal microbiota in various situations of disease, including in severe obesity.

This study aims to analyze the effect of synbiotics supplementation on body mass index in participants diagnosed with morbid obesity. The methodology used is the randomized clinical trial, placebo-controlled with blinding of patients, healthcare staff and outcome assessors, with follow-up of 90 days.

Patients will be randomized into two groups: control group to receive placebo (polydextrose - 12 g / day) and synbiotic group - group supplemented with synbiotic (fructo-oligosaccharide and probiotics - 12 g / day). Probiotics are: Lactobacillus acidophilus; Lactobacillus rhamnosus; Lactobacillus paracasei; Bifïdobacterium lactis.

At the moments proposed in this study, will be conducted assessments of food intake, nutritional status and metabolic / inflammatory parameters (body mass index, high-sensitivity C-reactive protein, albumin, triglycerides, total cholesterol, HDL-cholesterol and LDL-cholesterol, fasting blood glucose, glycated hemoglobin, fasting insulin, weight, height).

Inclusion Criteria:

• Obesity class III (body mass index ≥40kg/m2)

Exclusion Criteria:

• Current use of prebiotics and probiotics or use in the last three months
• Intolerance to prebiotics and probiotics

We will share the database containing de-identified individual participant data, data dictionary documentation, statistical analysis plan, and analysis code. Beginning 6 months following article publication, the trial steering committee will evaluate proposals of studies accompanied by a statistical analysis plan and may grant access to the data for approved proposals.

Beginning 6 months following article publication.

The trial steering committee will evaluate proposals of studies accompanied by a statistical analysis plan and may grant access to the data for approved proposals.