A food is something that provides nutrients.Energy for activity,growth and all functions of the body such as breathing,digesting food,and keeping warm,materials for the growth and repair of the body, and for keeping the immune system healthy. Good nutrition is also important because it is a way of leading a healthy lifestyle.Combined with physical activity, your diet can help you reach and maintain a healthy weight, reduce your risk of chronic diseases like heart disease and cancer, and promote your overall health.