To provide a method for producing a food product by which the amount of a liquid separated from a solid can be properly adjusted, and to provide a heat-cooked food product contained in a sealed container produced thereby. A method for producing a food product, comprising: A sealing step of sealing a container in which a target food material including a muscle fiber-containing food material a having muscle fibers and a muscle fiber-free food material B having no muscle fibers is filled with a salinity-containing seasoning C to obtain a sealed container; and a sterilization step of heating the sealed container to perform sterilization treatment, And a content ratio of the liquid in the content of the sealed container after the sterilization step is 25.0-33.0 mass perent. Figure 1

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