Diet can increase the risk of certain diseases. The problem of malnutrition is seen in the basis of many diseases.

For this reason, it is very important that the anatomical, physiological and psychological characteristics of the organism are properly nourished during and after the completion of growth and development. In addition, the importance of both pregnant and lactating mother nutrition in the health of the mother and the baby is indisputable.

Changes made in the form of nutrition in order to reduce the disorders related to nutrition and metabolism that occur due to various diseases that can be seen in all age groups, to prevent their progression and to help recovery are called "Diet Therapy". Diet should be organised according to the age, gender, body structure, eating habits, physical activity, social/economic conditions of the individual and by using appropriate food preparation and cooking methods.

Many chronic, endocrine, metabolic and malabsorption diseases can be corrected with lifelong dietary therapy in addition to drug therapy and sometimes even alone.