Objective: Epidemiologic studies suggest that higher levels of Body Mass Index (BMI) increase the risk of diabetes and there is strong relationship between Haemoglobin A1c (HbA1c) and BMI. This study examines the relationship between BMI and HbA1c and nutritional elements in adult persons. Methodology:The study covered 140 individuals in Alanya who are registered with a Family Health Centre and had their HbA1c measured in the period February 2017-February 2018. With the permission of participants, their anthropometric measures and biochemical analyses were taken from records retrospectively. Information about their dietary habits was collected by conducting face-to-face interviews on voluntary basis. Findings: Individuals with average age of 46.8±14.6 had average BMI value of 28.7±4.9 kg/m2, fasting glucose level of 9.,8±39.0 mg/dl and HbA1c value of %5.8±1.2'dir. The BMI average of individuals with HbA1c value 6.5% and over was found as higher than others with BMI average under 6.5% (p=0.04). There is positive correlation between BMI levels of individuals and HbA1c (r=0.230, p<0.01), fasting glucose (r=0.350, p<0.01), energy (r=0.230, p<0.01) and carbohydrate (r=0.220, p<0.01) consumption though at low level. Conclusion:In our present day, obesity and diabetes as major public health problems are important chronic diseases associated with dietary patterns. The outcomes of this study point out to the importance of measures of body weight, height and BMI at first step health facilities as HsA1c and basic anthropometric measures in improving public health and reducing the prevalence of chronic diseases.