A food exhibiting the effects of superior pathogen removal and disinfection that do not adversely impact the original flavor of the food is provided by a food production method comprising a step of washing a target food with a jet stream of a liquid containing gas microbubbles with a diameter of less than 1 µm. A packaged food is also provided by following the washing step with a cutting step where the target food is cut in an aseptic condition and a packaging step where the target food is aseptically packaged.