Doesn't seem to have to do with cannibalism or bread or wine but needing righteousness through Jesus to sustain life.
Blessed are they which do hunger and thirst after righteousness: for they shall be filled.
Matthew 5:6
RIGHTEOUSNESS, noun ri'chusness.
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Purity of heart and rectitude of life; conformity of heart and life to the divine law. righteousness as used in Scripture and theology, in which it is chiefly used, is nearly equivalent to holiness, comprehending holy principles and affections of heart, and conformity of life to the divine law. It includes all we call justice, honesty and virtue, with holy affections; in short, it is true religion.
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Applied to God, the perfection or holiness of his nature; exact rectitude; faithfulness.
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The active and passive obedience of Christ, by which the law of God is fulfilled. Daniel 9:7.
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Justice; equity between man and man. Luke 1:75.
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The cause of our justification.
The Lord our righteousness Jeremiah 23:6.