is eating meat on friday a sin
The sin is not/was not in eating meat on a Friday. The sin was in deliberately violating one of the Precepts of the Church. It is the same sin that you commit if you deliberately miss Mass on a Holy Day of Obligation, also deliniated in the Precepts of the Church.t was mortal sin for some who ate meat on a Friday some time ago and nothing for todays people who eat meat on a non-Lenten Friday.