We belong to the Lord no matter what
If we observe a day, we observe it to the Lord, and if we do not observe a day, to the Lord we do not observe it. Likewise, if we eat, we eat to the Lord, but if we decide not to eat, we can still do it to the Lord, being thankful for the times that we do eat (Romans 14:6).
These things are true because we do not live for ourselves, and we do not even die for ourselves, but we do both for the Lord (Romans 14:7, 8).
Therefore, for the rest of the day, remember that all you do and all you decide not to do, it is all for the Lord.