On 2 December 2022, the Ministry of Health, Labour and Welfare (MHLW) of Japan released the results of a survey of radioactive substances in food that was conducted between February and March 2022. The Japanese Ministry of Health, Labour and Welfare commissioned the National Institute of Health Sciences (NIHS) to purchase food actually distributed in 15 districts throughout Japan in February-March 2022 and to estimate the annual radiation dose of radioactive cesium in food. According to the results of the investigation, the estimated annual radiation dose to humans from radioactive cesium in food is 0.0005-0.0008 MSV/year, which is approximately 0.1 per cent of the upper annual dose of 1 MSV/year on which the current baseline value is set and is confirmed to be minimal. For samples with concentrations of radioactive cesium (Cs-134 and Cs-137 combined) above 0.5Bq/kg, radioactive strontium (Sr-90) and plutonium (Pu-238, Pu-239+240) will also be investigated, but no samples with concentrations of radioactive cesium of 0.5Bq/kg or higher have been investigated this time. Japan's MHLW will continue to conduct similar investigations to verify food safety. The Ministry says the long-term dose of radioactive material in food from the accident at Tokyo Electric Power Company's Fukushima No.1 nuclear power plant is mostly caused by radioactive cesium.