This study aimed to assess factors associated with overweight and obesity in adults from Rio Branco, Acre, in the western Brazilian Amazon. This is a cross-sectional, population-based study conducted in Rio Branco, which used data on individuals aged 18 years or older collected by the 2019 National Health Survey. Software R version 4.0.5 was used to estimate the prevalence of overweight and obesity, prevalence ratios, and 95% confidence intervals. Multiple analysis was performed by Poisson's regression with robust variance and hierarchical selection of variables. This study included 1217 adults. The prevalence of overweight was 58.2% (95%CI: 54.7-61.6) and of obesity, 20.1% (95%CI: 17.2-23.4). The factors associated with overweight were arterial hypertension (AdjPR: 1.45; 95%CI: 1.31-1.61), physical inactivity (AdjPR: 1.19; 95%CI: 1.04-1.36), age group (25-39 years, AdjPR: 1.49; 95%CI: 1.10-2.00; 40-59 years, AdjPR: 1.69; 95%CI: 1.28-2.23; 60 years or older, AdjPR: 1.37; 95%CI: 1.01-1.87); and smoking (AdjPR: 0.62; 95%CI: 0.41-0.93). The factors associated with obesity were arterial hypertension (AdjPR: 1.80; 95%CI: 1.41-2.30) and diabetes mellitus (AdjPR: 1.52; 95%CI: 1.08-2.13). Smoking and female sex remained in the hierarchical model for obesity, even without statistical significance. Despite intervention guidelines for these chronic diseases, there is a need for the public recognition of overweight and obesity and their possible associated factors in the Amazon and other regions with similar socioeconomic and demographic characteristics.
Keywords: health surveys; nutrition surveys; obesity; overweight.