ABSTRACT: Junk food refers to fast food which are easy to make and easy to consume. Junk food also called HFSS- High fat, sugar and salt. Various type of junk food that available in market. Junk food is more popular because of experience of great test and easy transportation. It causes a lot of harmful effects on mucosal layer of GI tract and also effect on the body like obesity, diabetes, heart disease, and skin cancer. This study identified that 66.66% had a inadequate knowledge, 33.33% had moderate knowledge none of them had Adequate knowledge for pre experimental group. The study results shows that the pre-test mean value is 14 2 and pre-test SD is 3 36. The post-test mean value is 23.53 and post-test SD is 2.44. The mean difference is 9.33. The calculated‘t’ value is 12.30 is higher than the table value 1.69. The stud6 structural teaching program is very effective for improving students’ knowledge regarding effect of junk food on GI tract.