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Fasting during Lent was more severe in ancient times than today. Socrates Scholasticus reports that in some places, all animal products were strictly forbidden, while others will permit fish, others permit fish and fowl, others prohibit fruit and eggs, and still others eat only bread. In some places, believers abstained from food for an entire day; others took only one meal each day, while others abstained from all food until 3 o'clock. In most places, however, the practice was to abstain from eating until the evening, when a small meal without meat or alcohol was eaten.

During the early Middle Ages, meat, eggs and dairy products were generally proscribed. Thomas Aquinas argued that "they afford greater pleasure as food [than fish], and greater nourishment to the human body, so that from their consumption there results a greater surplus available for seminal matter, which when abundant becomes a great incentive to lust."[7]

However, dispensations for dairy products were given, frequently for a donation, from which several churches are popularly believed to have been built, including the "Butter Tower" of the Rouen Cathedral. In Spain, the bull of the Holy Crusade (renewed periodically after 1492) allowed the consumption of dairy products[8] and eggs during Lent in exchange for a contribution to the war against Islam.