Gastric bypass and other weight-loss surgeries — known collectively as bariatric surgery (BS) —involve making changes to your digestive system to help you lose weight. BS is currently the most effective treatment for achieving permanent weight loss and improving comorbidities for severely obese patients (Adams et al. 2017, Tewksbury et al. 2017). The treatment rests on two main principles: restriction of the stomach’s volume, causing the patient to eat less, and a bypass intervention, reducing the nutritional absorption from the food consumed. These restrictive and malabsorptive effects cause instant weight loss, but the effects weaken after the first year (Martins et al. 2011). The bariatric body is still prominent in daily life, positively by displacing the overweight body and negatively due to the development of unexpected health problems after surgery.