One of the most frequent of the miraculous phenomena which have occurred in the lives of the  saints is the Eucharistic fast, in which the Eucharist was the principal, or only, food during prolonged fasts - or was the  sole nourishment for years at a time. The following are the many saints who have maintained such fasts.

Blessed Alexandrina Maria da Costa

Alexandrina Maria da Costa (30 March 1904 – 13 October 1955), also known as Blessed Alexandrina of Balazar, was a Portuguese mystic and victim soul, who was born and died in Balazar (a rural parish of Póvoa de Varzim). Alexandrina left many written works, which have been studied mainly in Italy by Father Umberto Pasquale and Signorile couple. On 25 April 2004 she was declared blessed by Pope John Paul II who stated that "her secret to holiness was love for Christ".
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Saint Catherine of Siena, T.O.S.D. (25 March 1347 in Siena – 29 April 1380 in Rome), was a tertiary of the Dominican Order, and a Scholastic philosopher and theologian. She also worked to bring the papacy of Gregory XI back to Rome from its displacement in France, and to establish peace among the Italian city-states. Since 18 June 1866 she is one of the two patron saints of Italy, together with St. Francis of Assisi.On 3 October 1970 she was proclaimed a Doctor of the Church by Pope Paul VI, and on 1 October 1999 Pope John Paul II named her as a one of the six patron saints of Europe, together with Benedict of Nursia, Saints Cyril and Methodius, Bridget of Sweden and Edith Stein.
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Therese Neumann was born on Good Friday, April 9, 1898, in Konnersreuth, Bavaria, a remote farming village of 1400 people. The daughter of a tailor and the oldest of ten children, she grew up in a strict, but loving, Catholic home.

Therese experienced her first vision of Christ—“The glorified child Jesus”—at age eleven during her First Communion, but didn’t consider it extraordinary; she thought this was what everyone experienced on this occasion. By 1913, she had decided to become a missionary nun and serve in Africa, but the outbreak of World War I delayed her entry into the convent.  

Therese Neumann was once asked how it was possible that she never ate or drank and lived on the Eucharist alone, and she responded “The Saviour can do all things. Did He not say that “my Flesh is real food, and my blood is real drink?” -  Read More > >