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Obesity has emerged as a major public health concern in recent years, with prevalence rising globally. As with other occupations, healthcare workers (HCWs) are affected by higher body mass index (BMI). According to a systematic review of the impact of personal health behaviors on health promotion practice, patients are more likely to accept advice from a visibly healthy healthcare professional than advice from a visibly overweight (higher BMI) healthcare professional. We aimed at several variables that were expected to affect BMI, such as resting metabolic rate (RMR), body age, and sleep quality. This is a randomized observational analytical study using a cross-sectional method. It was conducted from August to October 2020 in RSU Tadulako, Palu, Indonesia. Omron Karada scan HBF 375 measured body mass index, resting metabolic rate, and body age. Sleep quality was calculated by the Pittsburgh Sleep Quality Index. A total of 40 subjects (16 males/24 females) 40% vs 60%. The participants' ages ranged from 25 to 52 (39.78±6.94) years old, while their body ages ranged from 29 to 66 (47.70±9.32). The body mass index ranges from 15 to 33 (25.85±3.24). The Resting Metabolic Rate (RMR) ranged from 1084 to 1780 (1420.78±219.11). The Body mass index showed correlation using the Spearmann Two-Tailed Test of resting metabolic rate (r = 0.580, p = 0.000), body age (r = 0.722, p = 0.000), and sleep quality (r = 0.592, p = 0.000). This study implies that body mass index is statistically correlated with RMR, body age, and sleep quality.