This study aims to identify evasion predictors and factors in the preoperative period of metabolic bariatric surgery (MBS) through a review and evaluations of professionals involved, as well as patient knowledge and information, aiming at positive long-term results. This article performed a systematic literature review (SLR) in the PubMed, Scopus, and Web of Science databases. It used the PRISMA Protocol with a record of 7 years to obtain documents published a year before the pandemic, during and after it. The search strategy resulted in 4649 records, of which 51 studies were included in the review. Subsequently, an analysis was carried out in which the professionals who met the patient participated in a qualitative survey, in which the results were analyzed and compared to those obtained in the SLR. The decision to undergo MBS is influenced by fears, uncertainties, and the need for support, particularly for elderly patients. Health professionals are crucial in providing continuous guidance and support throughout the process.