The activity concentrations of natural (K) and anthropogenic (Cs) radionuclides were measured in the 30 most commonly consumed foods in Korea. The average activity-concentrations of K and Cs were 67 Bq kg and 46 mBq kg fresh weight of food, respectively. The total annual intakes of K and Cs by humans were 14915 and 3.64 Bq year, respectively. The calculated mean annual effective doses from ingestion of the investigated foodstuffs were 92 µSv for K and 0.047 µSv for Cs. Our results can provide useful background information on radiation protection in Korea, and in other countries as well.