Romans 14:5-8

In the same way, one person regards a certain day as more sacred than another, and another person regards them all alike. There is nothing wrong with having different personal convictions about such matters. For the person who observes one day as especially sacred does it to honor the Lord. And the same is true regarding what a person eats. The one who eats everything eats to honor the Lord, because he gives thanks to God, and the one who has a special diet does it to honor the Lord, and he also gives thanks to God. No one lives to himself and no one dies to himself. While we live, we must live for our Master, and in death we must bring honor to him. So dead or alive we belong to our Master.