It is said that practitioners ate mainly nuts and herbal roots instead of grain, but specific procedures have not been established because there are many beliefs as to what gokoku or jukkoku actually represent.
穀物以外の木の実や草根を主として食べたというが、五穀・十穀とされる穀物に諸説あるなどの理由から、やり方に決まった方法はない。