Background: The prevalence of sleep deprivation is rising globally as is that of obesity. The association between the two is also gaining much evidence. The medical students may be specifically affected due to decreased sleep duration. Aims and Objectives:The aim is to study the association between decreased sleep duration and obesity by means of body mass index (BMI) as a measure of obesity among the medical students. Materials and Methods: This is a crosssectional study among 199 medical students. The participants reported their sleep duration, and their height and weight were noted. BMI was calculated from data obtained. Students were categorized according to BMI into underweight, normal, overweight, and obese and according to sleep duration into >8 h, 6-8 h, and <6 h per night. Statistical analysis was done using ANOVA and unpaired t-test using GraphPad software, and P < 0.05 was considered statistically significant. Results: About 22.6% of the participants had a BMI >25 kg/m

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ABO and Rh blood group systems are the most important blood grouping systems from clinical aspect. Determination of blood group is important for blood transfusion therapy, medico-legal purposes, organ transplantation, settlement of paternity disputes etc. Nearly 25 types of blood groups are present. ABO incompatibility between mother and fetus may produce infertility or hemolytic disease of the new born, and persons of certain blood groups have an increased susceptibility to peptic ulcer or gastric cancer. The purpose of this review is to summarize the concepts and origin of ABO and other blood groups systems and Chemistry of Blood group specificity (Glycoproteins found in body fluids).