Purpose: This study examined the factors affecting dietary, exercise, and behavioral modification of women on diet improvement using mediating effects of improving the quality of life.Methods: To conduct this study, a survey was conducted on female clients with obesity in eight franchise body-type management rooms in May 2022. Consequently, out of the 318 copies of the questionnaire, 275 copies were used for analysis, excluding false answers. The analysis of this study was conducted using Predictive Analytics SoftWare Statistics by Statistical Package for the Social Sciences (SPSS) 19.0 and AMOS 19.0. First, frequency analysis was conducted to analyze the general characteristics of the study subjects, and factor analysis was conducted using Varimax rotation to derive variables as a dimension of factors. Second, reliability analysis was conducted to calculate the reliability coefficient (Cronbach's α). Third, confirmatory factor analysis was conducted to analyze the reliability and validity of the model, and model suitability was confirmed using RMSEA, RMR, GFI, NFI, TLI, and CFI values. Fourth, structural model analysis was conducted for the process of confirming the research problem, and lastly, Sobel verification of the mediating effect was conducted.Results: The results of Sobel verification for the intermediate path were as follows: Recognition affecting diet improvement mediating the improved quality of life is 3.017 (<i>p</i><0.05); attitude is 2.691 (<i>p</i><0.05); action is 0.997 (<i>p</i><0.05); durability is 1.607 (<i>p</i><0.001); and effectiveness is 0.961 (<i>p</i><0.001), respectively.Conclusion: It is vital to analyze the current status and needs of people with obesity’s diet, exercise, and behavior modification, as well as to supplement them using various devices to conduct the set living rules properly. Thus, attention and efforts from the government, private sector, schools, and local governments are needed to provide conditions for improving the quality of life and continuous diet.