Fast foods are easy available and their delicious taste help students especially the teenagers, get hooked on to it. Fast foods are addictive, and are the silent killer. Aim of the study: Evaluating the effectiveness of healthy nutritional program on cognitive and physical function among fast food addict students. Setting:-Faculty of Nursing Menoufia University. Design:-quiz experimental design (one group pre post test) was utilized. Sample: a purposeful sample of 183 first year female nursing students. Data were collected using structured interviewing questionnaire schedule, it consisted of two parts: Part one: socio demographic data as age, sex, marital status, and education. Part two: assessment of student's knowledge about balanced diet and their state of cognitive and physical function. The collected data were organized, tabulated and statistically analyzed using soft ware statistical computer package version 13. Descriptive statistic for quantitative data using mean and stander deviation while for qualitative data using frequency and percentage for comparison before and after the program using chi-square for qualitative data. Significance adopted at P<0.05 for interpretation of the results of tests of significance. Result:-there were statistical significant improvements of students' knowledge, level of performance, cognitive and physical function also student's perception about dangerous of fast food 3 months post program than pre program. Conclusion:-It is concluded that: the program about healthy nutrition had a positive effect on student's knowledge, cognitive and physical function. Recommendation:-based on this study it was recommended that: special attention should be given regarding teaching students family members about the importance of balanced diet and healthy food to minimize fast food addiction and improve students' cognitive and physical function.