I happen to be old enough to remember as a young Catholic kid that it was considered a "mortal sin" to eat any meat on any Friday except fish, then after the second Vatican Council it was cut down to just the Fridays of lent, then to just Good Friday. But I have found no Biblical basis for this because nowhere in it does it stipulate you should not eat meat on certain days, even though many Christians denominations and creationists in particular don't eat meat on Good Friday. So it does sound kind of odd to me that in one of the few references in the bible about diet, especially about keeping pork off the menu, that most Christian creationists choose to ignore it.