A mental fixation can also be a cause of disease. Most people tend to use certain parts of their body excessively, and habitually eat particular foods, and this leads to the decline of other abilities.
還有心的偏執也是導致患病的原因，多數人過度偏執使用部分器官，嗜食特定食物，導至其他的機能退化，廣義的職業病就是。