《黄帝内经·素问·六元正纪大论》
其气化致病时，司天热化所致宜用咸寒，年运雨化所致宜用苦热，在泉燥化所致宜用酸温，这就是所谓适宜的药食性味。乙丑年、乙未年：上为少阴浊土司天；中为少商金运不及；下为太阳寒水在泉。
乙丑、乙未岁：上太阴土，中少商金运，下太阳水，热化寒化胜复同。
When the climate leads to illness, it is advisable to use salty and cold items if the illness is caused by hot climate, bitter and hot items if the illness is caused by rainy climate, and sour and warm items if the illness is caused by dry climate. This is what we call the appropriate dietary properties. Yi Chou and Yi Wei year: the climate is dominated by the Shaoyin turbid earth, the annual climate is dominated by the Shaoshang metal, and the spring climate is dominated by the Taiyang cold water.