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From the point of view of radioprotection observation (follow-up) of the levels of radioactivity is necessary, because of the negative consequences of radiation on the human organism. The main sources of natural radioactivity in our environment are the series of 238U, and 232Th together with their daughter radionuclides, as well as 40Κ, while 137Cs is one of the artificial radionuclides found in nature, important due to its long half-life. These radionuclides manage to get in the human body through diet. In this Paper the concentration of these radionuclides has been estimated in dairy products and vegetables produced in Greece. Food samples from various districts of our country were collected and analyzed through gamma spectroscopy in order that concentrations of the prementioned radionuclides in them be calculated. Although in the majority of our samples radioactivity due to the 238U, 232Th and 137Cs was not traced, in some cases it was found but in very low concentrations.On the contrary, detectable concentrations of radioactivity due to 40Κ were found in most foods, with higher values in the peanuts of Aegina island (257 Bq/Kg), in sow thistles -Sonchus oleraceus- (253Bq/Kg) and in almonds (198 Bq/Kg). The lowest concentrations of activity due to 40Κ were traced in diary products (12-38 Bq/Kg) and in flour (23 Bq/Kg). Based on these concentrations and on the Mediterranean Diet recommendations, the annual per capita radioactivity due to the reffered foods was calculated for 40Κ. Νext, the annual equivalent dose for 40Κ was calculated. The overall annual equivalent dose taken by the average adult is estimated 0,09 mSv/year, the largest contribution coming from dairy and bananas (0,02 and 0,03 mSv/year respectively)