What does Ezekiel 4:9 mean?

'Take wheat, barley, beans, lentils, millet, and spelt. Put them in one container and use them to make bread. That's what you'll eat during the days you lie on your side.' Ezekiel 4:9 - Modern Text Bible

(Ezekiel's food is a mix of grains and legumes, symbolizing scarcity and hardship during the siege.)