Speak to the children of Israel, saying, 'These are the animals which you may eat among all the animals that are on the earth:"
There are some people who have dietary restrictions due to a medical condition or even because of certain health goals. Some things might be alright for these people to eat, and other things have to be avoided to maintain the person’s health standards. In the Old Testament, God told His people there were some things they could eat and others they were not allowed to eat. There were a couple of reasons for this, but the main point is that like people with medical problems or for health reasons, some things were good for the Israelites to eat and some were not.
There are some things we should and should not eat naturally, and some things we should and should not “eat” spiritually. In places like Leviticus 11, God gave Israel guidelines about what to eat and what not to eat. God told them there were some things they should not eat that in one or more ways may have seemed good. The same thing is true for us today spiritually. Some things may seem good in one way spiritually, but they are things that we really should avoid. An easy example of this is a teaching that comes from a well-known minister, but it directly contradicts the Bible.
As Christians, we really do not have any natural dietary restrictions that need to be followed, like in the Old Testament, but there are some spiritual dietary restrictions that would be good for us to pay attention to. Something may look good in one aspect, but be bad in another and we should avoid it. Too many Christians get caught up and then blown around by every wind of doctrine (Ephesians 4:14) which is why we shouldn’t just eat everything, spiritually speaking. God knows what is best for us and He has given us spiritual principles in His Word as our standard for what to partake of spiritually.