The kingdom of God

This morning I was randomly pray-reading the verse in Romans 14:17

For the kingdom of God is not eating and drinking, but righteousness and peace and joy in the Holy Spirit.

I've come across this verse for a lot of times, but while I was reading it this time, I asked a question to myself - "why it is not eating and drinking?" because another verse came to me. 

The Son of Man came eating and drinking; and they say, Behold, a gluttonous man and a drunkard, a friend of tax collectors and sinners. Yet wisdom is justified by her works.(Matt. 11:19)