The production method according to the present invention comprises: a step for preparing a food product composition that contains a deacylated gellan gum and solid ingredients; and a step for obtaining a frozen fluidic food product containing solid ingredients by freezing the food product composition at -5°C or lower. It is preferable for the fluidic food product to have a viscosity of 300 mPa·s or lower. It is also preferable for the food product composition to contain 0.001-1 mass% of a deacylated gellan gum. The present invention also provides a method that is for improving the quality of a fluidic food product, and that involves: preparing a food product composition that contains a deacylated gellan gum and solid ingredients; storing and packaging the food product composition in a packaging container; and freezing the same at -5°C or lower.