Nutrition is the science that interprets the interaction of nutrients and other substances in food in relation to maintenance, growth, reproduction, health and disease of an Being.It is necessary to eat a healthy nutritious diet , A poor diet can cause deficiency diseases such as blindness, anemia, scurvy, preterm birth, stillbirth and cretinism health-threatening conditions like obesity and metabolic syndrome and such common chronic systemic diseases as cardiovascular disease,diabetes,[and osteoporosis.