Nutrition is the study of food and the nutrients it contains. It looks at how these nutrients interact and affect our health. While food has always been essential for survival, it was initially seen only as an energy source. Unani Medicine, one of the earliest medical systems, changed this view, showing food as a tool for maintaining health and body balance.

Food therapy, a significant part of Unani Medicine, uses food to nourish and strengthen the body. It also aids in disease prevention and life extension. Diet therapy, a non-drug treatment approach, helps patients achieve health through changes in their diet. This could mean fasting or adjusting the amount of food consumed based on its nutritional value.

Dietotherapy involves using food to recover from illness effectively. In some metabolic and chronic diseases, modified diets serve as the main treatment. They act as a preventive and therapeutic aid, underlining the crucial role food plays in our health.