Aside from giving up something, those that observe Lent will also be spending the next seven Fridays whipping out those fish recipes and abstain from eating meat.

Lent, which typically is the time period from Ash Wednesday through Easter, is meant to be celebrated with self-sacrifice, prayer and other religious activities leading up to Easter, and one of the rituals is not to eat meat on Fridays during Lent. 

Because of the rule, Christians and Catholics often cook seafood or attend fish fries to eat. It’s even the reason why McDonald’s Filet-O-Fish exists. However, the rules of what people are allowed to eat can get confusing.

Here’s what to know about what people can and can’t eat on Fridays during Lent:

What is Ash Wednesday? What is Lent?:Here’s what to know as Christians, Catholics begin Lent

Filet-O-Fish:How McDonald’s Lent staple was created

Why can’t you eat meat on Fridays during Lent?

It wasn’t that long ago when Christian law said worshipers weren’t allowed to eat meat on Fridays at all, according to the Archdiocese of Saint Paul and Minneapolis, as it was in place until 1966. 

“That’s when Catholics started eating meat on Friday, because it wasn’t strictly forbidden anymore,” William Johnston, associate professor of religious studies at the University of Dayton, told USA TODAY.

In 1983, the Code of Canon Law of the Catholic Church revised the rule to where meat wasn’t allowed to be eaten on Ash Wednesday and Good Friday, the Archdiocese says, adding the U. S. Catholic Conference of Bishops extended the law to include all Fridays during Lent.

Children and elderly people are usually exempt from fasting and giving up meat. 

What is the meaning of not eating meat?

Abstaining from eating meat reflects the life of Jesus Christ.

“Since Jesus sacrificed his flesh for us on Good Friday, we refrain from eating flesh meat in his honor on Fridays,” the Archdiocese said.