Hu Sihui (Chinese: 忽思慧, 和斯輝, 忽斯慧, also Hu Zheng Qi Huei; active nr. 1314–1330) was a Chinese court therapist and dietitian during Yuan dynasty. He is known for his book Yinshan zhengyao (Dietary Principles),[1] that became a classic in Chinese medicine and Chinese cuisine.[2] He was the first to empirically discover and clearly describe deficiency diseases.[3]