B.M.I and I.Q, both, are locally and internationally on the rise. A link between the two is likely but which one is influencing the other still remains a mystery. To solve the mystery of correlation between Intelligence quotient (IQ) and Body Mass Index (BMI) and to ascertain whether I.Q has any significant measurable effect on B.M.I, this study is conducted among the students of Liaquat University of Medical and Health Sciences Jamshoro. A structured questionnaire-based cross-sectional study was conducted on 120 students of Liaquat University of Medical & Health Sciences, of both genders, aged between 18-25 years. IQ was recorded using a questionnaire comprising twenty questions, designed on the principle of internationally taken IQ tests; students were advised to solve the test within 10 minutes. For BMI calculation, height and weight measuring machine (RGZ-160) was used; height was measured in m2 and weight in kg. According to WHO classification of BMI, students were divided into four classes, i.e., class-1 (under weight, BMI <18), class-2 (normal weight, BMI 18-24) and class-3 (over weight BMI ?25), class-4 (obese BMI ?30). Data analysis was done on MS excel by applying students t-test. Students having average I.Q values of 5.09 and 5 belonged to class-1 (under weight), class-2 (normal weight) respectively, whereas students possessing an I.Q of 6.5 and 7 belonged to class-3 (over weight), class-4 (obese) respectively. IQ of class 3 and 4 students was found significantly higher (P = 0.01) than the class 1 and 2. Students having BMI values >25 had greater I.Q level. The findings can be associated to the life styles and habits of these people.