《黄帝内经·素问·阴阳应象大论》
凡气味辛甘而有发散功用的，属于阳；气味酸苦而有通泄功用的，属于阴。
气味，辛甘发散为阳，酸苦涌泄为阴。
Any smell that is pungent or sweet and has a dispersing action belongs to yang; any smell that is sour or bitter and has a cathartic action belongs to yin.