 40 ml venous blood will be collected in three separate tubes. One tube of 10 ml will be sent to the Clinical Pathology Labs for the measurement of complete blood count, complete metabolic panel, fasting lipid profile for the measurement of triglycerides, high density lipoproteins, low density lipoproteins, very low-density lipoproteins. The complete blood count and complete metabolic panel will be done to rule out infection or any other co-morbidity. Another 10 ml tube will be sent to Clinical Pathology lab for the measurement of serum 25-hydroxy D levels. The third tube with 20 ml blood will be used to measure protein and mRNA expression of vitamin D receptor VDR, CYP24A1 and CYP27B1, and to measure leptin and adiponectin levels. 