Byzantines pay attention to health care and prevention. The widely circulated Diet Almanac divides the four seasons into four stages: wet, hot and cold, and lists the foods that are suitable for eating and taboo in detail. They believe that diseases are the result of various factors and disorders in the human body, so the key to treating diseases lies in conditioning. The best way to treat a disease is to rest, keep warm and sweat. Health preservation should be more important than treating a disease.