FACTORS ASSOCIATED WITH CHANGES IN BODY MASS INDEX AMONG MARRIED COUPLES IN SOUTHERN THAILAND

Abstract

Post-marital changes in body weight are important indicators of health behaviors and lifestyle among married couples, particularly in early adulthood. This study aimed to examine changes in body mass index (BMI) after marriage among couples in Southern Thailand and to analyze personal, familial, and lifestyle factors associated with BMI changes, as well as factors that can predict post-marital BMI. The research employed a descriptive-correlational design, collecting data using a four-part questionnaire, including personal information, dietary behaviors, physical activity behaviors, and marital satisfaction. The sample consisted of 115 married couples residing in Southern Thailand. Data were analyzed using descriptive statistics, Pearson correlation, and multiple regression analysis.

               The results indicated that mean BMI after marriage was significantly higher than before marriage (t(114) = -9.72, p < .001). Dietary behaviors and physical activity were significantly correlated with BMI changes (r = -0.388 and r = -0.257, respectively, p < .01) and could significantly predict post-marital BMI (β = -0.21 and -0.18, respectively, p < .05). In addition, marital satisfaction showed a positive correlation with BMI (r = 0.196, p < .05) and was a significant predictor (β = 0.21, p < .05). These findings highlight the importance of promoting healthy behaviors, dietary control, and regular physical activity among couples in early marital life to reduce the risk of obesity and long-term health complications.