摩訶止觀 8.75

8.75

又身火在下，消生藏，令飲食化溜，通變一身。世諺云：「欲得老壽，當溫足、露首。」若身火在上，又噉不安身食，則有病惱。次、食五味增損五藏者：酸味增肝而損脾；苦味增心而損肺；辛味增肺而損肝；鹹味增腎而損心；甜味增脾而損腎。若知五藏有妨，宜禁其損而噉其增，以意斟酌。

Moreover, the bodily fire is below, digesting [food in] the stomach and causing food and drink to transform and flow, permeating throughout the whole body. As the worldly proverb says: 'If you wish to attain longevity, keep your feet warm and your head cool.' If the bodily fire is above and one also eats food that does not agree with the body, illness and distress will occur. Next, regarding the five flavors increasing or harming the five viscera: sour flavor increases the liver and harms the spleen; bitter flavor increases the heart and harms the lungs; pungent flavor increases the lungs and harms the liver; salty flavor increases the kidneys and harms the heart; sweet flavor increases the spleen and harms the kidneys. If one knows that the five viscera have impairments, one should prohibit what harms them and eat what increases them, weighing this according to one's judgment.