A very old Greek word that is being used in European languages with a slightly different meaning.
The original (and real) meaning of the word was “Way of life” and not only “nutrition”. It also included the physical exercise, food and drinking of wine.
Hippocrates, the father of Medicine had written several books about the Diet and its relation to health like ‘’About Diet (A’, B’, C’, D’) ’’.
Reading through one understands the absolute relation between good diet and good health.
You may see in the following list this word in 15 languages.