So we are left with one of two options:
1. Jesus assumed people would fast based upon Jewish practices of the time.
2. Fasting isn’t as crucial a discipline in light of the eschatological presence of Christ with us by the Holy Spirit’s indwelling. It all depends on how you interpret Luke 5

33They said to him, “John’s disciples often fast and pray, and so do the disciples of the Pharisees, but yours go on eating and drinking.”
34Jesus answered, “Can you make the guests of the bridegroom fast while he is with them? 35But the time will come when the bridegroom will be taken from them; in those days they will fast.”

Ones fasting position depends on if you interpret the taken away from as the three days in the grave or the continued absence of Jesus until He returns.

I would argue that there is some type of assumption of fasting is intended based upon its two usages in Acts though Acts is not always prescriptive for the Church but more descriptive of the early spread of the Gospel.

Interesting in the OT there is tie of fasting to seeking justice.

With that in mind maybe you ought to write a song entitled…
LOOK AT ME WORLD, I’M FAST BECAUSE I LOVE JESUS!!!

The only one I’ve come up with so far is not a perfect fit, but it will work. “Come, Let Us Return to the Lord” by Matt Redman. It’s not overdone at our place like I’ve heard it is in other churches, and our folks sing out on it really well.