Abstract
INTRODUCTION: Calcium is one of the most important elements in the human body playing a crucial role in various physiological functions. Its serum levels might be influenced by multiple factors. Obesity is a prevalent disease worldwide, and many studies have explored the relationship between obesity and serum calcium levels. This study aimed to investigate the association between Body Mass Index (BMI) and serum calcium. MATERIAL AND METHOD: This cross-sectional study conducted at the National University Hospital between 2023 and 2024 involved 206 participants. Serum calcium levels were measured. A fasting morning blood sample was collected from each subject, and all tests were performed at The National University Hospital. RESULT: The analysis showed no significant association between BMI and serum calcium levels, nor between age and serum calcium. However, after adjusting for age, the relationship between BMI and serum calcium strengthened and reached statistical significance, revealing an inverse correlation. This suggests that age acted as a partial confounding variable in the initial assessment. CONCLUSION: While the initial findings of this cross-sectional study initially revealed no significant relationship between body mass index (BMI) and serum calcium, after adjusting for age, an inverse relationship was found between BMI and serum calcium, with higher BMI associated with lower serum calcium levels.