When the person moves to a very cold environment, the vital force cannot generate enough heat, and, according to Unani, the person may suffer greatly from sadness, depression, and melancholy and many other ailments. The color of hair also results from internal conditions. The evaluation of eye color also provides information of the metabolic efficiency of a person. Blue eyes are caused by the opposites of those producing black eyes. Gray and brown eyes are the result of combining of the black and blue factors.
Green eyes are the result of blue pigmentation being admixed with yellowed phlegm deposits.
Table 4 summarizes the various physical faculties of the human being, arranged according to the predominating temperaments and humors. There are five factors that will determine the particular organ or system in which the symptoms of disease appear. Now you will have a composite profile of the body and its parts according to Unani traditional healing, and the basic ways in which the health is evaluated to determine how and where an imbalance of humors arises. The Unani system considers that foods and beverages taken in as nutrients constitute the building materials of the body, including the humors. Therefore, the selection of foods for general nutrition and in correcting imbalances forms the most central part of the Unani system of healing.