However, if your body craves fish while fasting, do not eat any

[Mary Naeem]

Pope Shenouda III



However, if your body craves fish while fasting, do not eat any.
This does not only apply to fish, but to anything that you may crave in order to control your desires when fasting, even if it may be permitted.
Is not marriage lawful? Yet, those who fast stay away from sexual intercourse while fasting in order to have self control. (1Cor 7:5). The Gentile King, Darius did the same. (Dan 6:18).