Junk food refers to fast food, which are easy to make and easy to consume. They are low in nutritional value and have only lying fat in it causing ill effect on the health of consumer. Junk food contains high level of refined sugar, white flour, Trans fat, polyunsaturated fat salt and numerous food additives such as monosodium glutamate (MSG) and tartrazine, and lacking in protein, vitamin and fiber. It should be avoided, because of lack of energy, high cholesterol and poor concentration. It causes a lot of harmful effect on the body like obesity, diabetes, heart disease and various types of skin cancers.