Ezekiel 4:9-11

The prophet was also to make provisions so that he would have adequate food to eat and water to drink as he lay on his side for the first 390 days. The Lord prescribed just what and how much he should consume each day: one and one-third pints of water and eight ounces of bread. These were famine rations. His bread was to be a combination of six grains rather than just one, similar to how people during a siege would have to make their bread. They would mix small amounts of whatever they could find rather than using larger quantities of a single grain.

Ezekiel may have eaten at other times of the day when he was not acting out his drama, but during his dramatic presentation each day he only ate and drank as people under siege in Jerusalem would do.