UN nuclear watchdog IAEA has warned of the risks to humans of ingesting contaminated food products, after Japan said it had detected abnormal levels of radioactivity in milk and spinach. Japan's health ministry had confirmed that the substance found in higher-than-usual doses in foods near the quake-damaged Fukushima No.1 plant northeast of Tokyo was radioactive iodine. The food contamination was measured between March 16 and 18, said the IAEA, which has been monitoring developments at the nuclear plant for the past week.