 His studies of glucose metabolism and the chemical composition of common foods contributed to the scientific analysis of nutrition in the Korean diet.Suksin Lee was born in P'yŏngannam-do, Korea, the son of I Myŏngse and a woman of the Koksan Kang family.He earned his medical degree from Kyŏngsŏng Medical College (now Seoul National University) in 1921, and obtained his medical license in August of that year.