Diet is the most important single factor that can make us healing or sick. Therefore, the right knowledge of right food and habits is of primary importance in the maintenance and promotion of health, prevention and care of diseases. Nutritional values of the food alone do not fulfil the purpose. It should also be suitable to the system.

Fresh and state foods should be considered for its nutritional values and acceptability. If the food consumed is not fresh, though it may contain many nutrients as per the chemical analysis, it will not be beneficial for the maintenance of sustainable, positive health.