A diet is the type, quantity and quality of food and drinks we consume.
Food is something that nourishes our body.
Since before birth and until before dead food is a dominant and necessary factor in our every day life for our survival. Food provides us energy to do our everyday activities and to carry on vital functions. But food is much more than a mere nutrient, because all of us find in food a pleasure. Independently of it's sweetness, all carbohydrates contain 4 calories per gram. The main function of carbohydrates is to provide energy to carry on the body functions and provides heat to keep body temperature.