This is a cohort study with the objective of describing during a 12-month follow-up, weight loss in obese patients submitted to treatment using two consecutively air-filled IGB (Heliosphere® 600 cc and Heliosphere 720 cc) without any interval between the removal of the first and the placement of the second.

Intragastric balloon (IGB) implantation is a widely used technique to treat overweight subjects and those with mild obesity. The effectiveness of the air filled balloon (Heliosphere BAG®) in improving weight loss, reduction of BMI, percentage of body weight loss, percentage of excess weight loss and complications six months after placement is notable. Several methods are available for IGB placement and new techniques are being developed to reduce discomfort during and after the procedure. Thus, the use of an IGB as an effective method to avoid bariatric surgery is proposed. However, the precise protocol to balance complications and discomfort while maximizing weight loss is still to be established.

Our secondary objectives will be:

• Describe the weight loss, changes in the BMI and excess weight loss between the implantation of the first IGB until its removal;
• Describe changes in the components of the metabolic syndrome;
• Describe changes in blood pressure;
• Estimate the rate of early explant;
• Describe the conditions of surgery;
• Describe operative complications;
• To describe safety in the perioperative period, in the immediate postoperative period and in the late postoperative period

Inclusion Criteria:

• Class I obesity (30-34.9 kg/m2), Class II obesity (35-39.5 kg/m2) or overweight (25-29.9 kg/m2).

Exclusion Criteria:

• Morbid obesity (BMI>40kg/m2), operative contraindications.

Obese or overweight individuals eligible for gastric balloon placement and with no contraindications for the procedure will be recruited from the Mario Covas Hospital and the Kaiser Day Hospital.