Foods that Catholics cannot eat are meat on Ash Wednesday and all Fridays during Lent which includes Good Friday.
This means that Catholics will avoid any pork, chicken, beef and turkey on these days.
However fish is acceptable as a substitute.
The primary food restriction for Catholics is to abstain from eating meat on designated days which is primarily Ash Wednesday and all Fridays on Lent.
Fish is acceptable to eat on these days even though other meat is not allowed.
The rule typically applies to Catholics that are aged 14 and older.
And people who are pregnant, ill or the elderly can be exempt from the fasting restrictions.
Catholics dietary restrictions are ancient and for Jews these rules can be found in the Old Testament.
However, for Catholics and most Christians, there are no dietary restrictions (except such rules as no meat on Fridays during Lent).