What we eat

Saying the "blessing" at table is actually more than just a pleasant (maybe old-fashioned?) convention.  We are truly asking for the sanctification of the food and drink we consume.  The blessing is serving a real purpose.

"For it is sanctified by the word of God and prayer." (1 Timothy 4:5)

Another point - thankfulness.  To summarize: it is "good" if we are thankful and ask God's blessing.