Introduction: The body composition assessment methods used in nutrition are diverse and
each technique was developed in order to assess the patient's actual nutritional status.
Bioimpedance (BIA) stands out as a safe and minimally invasive method, presenting results to
better assess the body composition of individuals with obesity or who underwent metabolic
surgeries. Objective: To analyze and describe the results of Bioimpedance in obesity and in the
followup of bariatric surgery in patients seen at the nutrition clinic of a university hospital in
Belém/Pa. Methodology: This is an analytical observational cross-sectional study carried out
during the first half of 2021 through the analysis of the medical records of patients participating
in the research on obesity and obesity surgery treated at the nutrition clinic of a university
hospital in Belém\PA. The analysis of the relationship between the variables that describe the
patients' body composition [BMI, percentage of body fat (%), fat mass, total body water and
skeletal muscle mass] was performed. The project was approved by the Research Ethics
Committee of the Institute of Health Sciences (ICS) of the Federal University of Pará under
number 2,516.980\2018. Results: Data from 115 patients were analyzed. The Mann-Whitney
statistical test showed a significant difference between gender and BMI of patients (p < 0.0001),
demonstrating that most of the population studied, about 35.7%, has a BMI in grade I obesity
and that most of the audience is female. Furthermore, the patients were divided into two groups
of equal numbers (n=57), with one group consisting of those who underwent bariatric surgery
and the other composed of those who had never undergone it. Thus, it was possible to compare
the BMI parameter between the two groups. The Student's t test performed for comparison
showed a significant result (p <0.0001), demonstrating that the lowest BMI values are among
the group that underwent bariatric surgery. Discussion: Accordingly, Zujaja Tauqeer et al.
(2018) obtained data from the National Health and Nutrition Survey of the United States that
show the high overall prevalence of obesity in adults and the highest prevalence of obesity in
the female audience (40.4%) ( TAUQEER, GOMEZ AND STANFORD, 2018). As well as
Braz, et. al (2020), the present study found that among patients with BMI in “eutrophy”, 4 of
these had body fat parameters above normal, and levels of muscle position and hydration intact
(BRAZ et. al, 2020). As well as Rêgo et. al (2017), Castanha et. al (2018) and Tedesco et. al
(2016), this study found a significant difference (p <0.0001) when comparing the BMI of the
group that underwent bariatric surgery with the BMI of the group that did not, demonstrating
that the weight loss of patients undergoing bariatric surgery is effective and reaches the purpose
of surgical indication (CASTANHA et. al, 2018; RÊGO et. al, 2017; TEDESCO et. al, 2016). Conclusion: The present research concludes that the method of body assessment by
bioimpedance presents reliable results in the assessment of obese patients who have undergone
any bariatric surgical procedure.
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