Diabetes mellitus is recognized as a chronic disease closely linked to an individual’s lifestyle. Objective: To identify the lifestyle patterns of adults with diabetes mellitus. Methodology: A cross-sectional, descriptive, exploratory study. The IMEVID lifestyle questionnaire for people with diabetes mellitus was administered, covering seven dimensions—nutrition, physical activity, tobacco use, alcohol consumption, diabetes knowledge, emotions, and treatment adherence—across 25 questions, with a reliability coefficient of 0.81. Participants were recruited through a social media platform, including adults of both sexes regardless of time since diagnosis; the questionnaire was administered using Google Forms using a random sampling method. A pilot study was conducted before final data collection. The data were analyzed using SPSS v.25 software. The ethical considerations outlined in the General Health Law, the Declaration of Helsinki, and the Nuremberg Code were observed. Results: 71% of the participants were women. The mean age was 49.79 years (SD 14.3). 5.9% of the participants reported that they do not treat their diabetes with medication. 44% of the participants had an unhealthy lifestyle, and 41% had a moderate lifestyle. Tobacco use and accessing/seeking information about the disease were among the most significantly altered dimensions. Conclusions: People with diabetes need to adopt healthy lifestyles that promote effective management of the disease and help prevent complications.