A descriptive study to assess the Body Mass Index and Food habits pattern among adolescents in a selected school at kelambakkam. The objective was to find out the association between BMI& Food habits pattern. To find out the association between Body Mass Index& Food habits pattern selected demographic variables. The sampling technique was non probability, convenient sampling technique with 95 samples and questionnaires were formulated, structured interview schedule and anthropometric assessment were used to collect data. The collected data was tabulated and analyzed .Descriptive and inferential statistics were used. The mean value is 11.There were no significant association between the anthropometric measurements with selected demographic variables. The collected data was tabulated and analyzed .Descriptive and inferential statistics were used. The mean value is 11. The study shows that 23 adolescents were under weight, 53 normal ranges, and 15 preobese, 3 obese class one, 0 obese class two and 1 obese class three knowledge.