Food is one of the basic needs of the human being. Every day, we eat a large variety of foods. Have you ever thought about how the foods are categorized? They are classified in different groups depending on different criterions such as: origin, composition, function and so on. What about nutritional benefits? How are the foods classified? In my point of view, there are three basic food groups according to their nutritional benefits: carbohydrates, proteins and vitamins. They have different nutritional values and they are equally essential for our health.