Every individual in this world wants to lead a healthy life. Food is the main basis for maintaining health. So, the knowledge of food and nutrition is essential for every individual . Generally, food and nutrition are considered synonymous with one another, when actually it is not so. In fact, food comprises all those substances that human beings consume for their survival. Food is a mixture of various substances which are essential for life. where nutrition is a dynamic process which comprises consumption of food to remain healthy. In fact, nutrition is essentially the process of nourishing or being nourished. The process by which a living organism assimilates food and uses it for growth and replacement of tissues is called nutrition. Nutrition is defined as the science of food and its relationship with health. In other words it can be said that nutrition is the science of foods which comprises the dynamic process in which the consumed food is digested, nutrients are absorbed and distributed to the tissues for utilisation and wastes are disposed of the body. Macro nutrients constitute the majority of individuals diet. Hence it can be said that they are taken in large amounts. They supply energy and are needed for growth and maintenance of the body. They include carbohydrates, proteins, fats and water. The explanation of these macro nutrients is given below Carbohydrates are the most important source of energy. They contain the elements of carbon, hydrogen and oxygen. The very first part of the name carbo means that they contain carbon the second part of the name hydr means that they contain hydrogen. The third part of the name ate means that they contain hydrogen. The third part of the name ate means that they contain oxygen. In all carbohydrates, except rhamnose the ratio of hydrogen atoms to oxygen atoms is just like water