In spite of having great and excellent quality of restaurants, people have amazing craziness for road-side foods specially fast foods. Increased consumption of street vended foods can immensely contribute to provision of nutrients and availability of food to millions of people world-wide. The objective of the present study was hence to evaluate nutrient components especially fat and energy content of fast food sold in streets of Muzaffarpur town and compare it with RDA of different age groups. A total of 14 fast food samples from streets were collected from different locations of Muzaffarpur town in aseptic containers and immediately transferred to the laboratory for fat analysis. Descriptive statistics such as percentage means and standard deviation were used to analyze the collected data. In terms of nutrient contribution, the highest level of energy was found in Chilli chicken followed by Samosa ,Chhole bhature and Chowmein. One serving of Chilli chicken, Samosa, Chhole bhature and Chowmein would provide approximately 409Kcal, 235Kcal, 185Kcal,182 Kcal energy from fat present in them respectively. One serving of Chilli chicken would provide approximately 20% of RDA for calories for all age groups. One serving of Samosa would provide approximately 10% of RDA for calories for all age groups. Per serving of Chhole bhature and Chowmein would provide approximately 8% of RDA for calories for all age groups. Chilli chicken, was found to provided approximately more than 200 % of daily fat intake of all age group . Per serving of Chhole bhature, Chowmein and Samosa were found to provided approximately more than 100 % of daily fat intake of all age group. From this study it was concluded that street vended fast food provide a source of affordable nutrients to the diet of people who consume street foods in Muzaffarpur town.