Colossians, chapters 1-4

“Although those things have an appearance of wisdom in a self-imposed form of worship and a false humility, a harsh treatment of the body, they are of no value in combating the satisfying of the flesh.”
~Colossians 2:23

Is it wrong to fast?
Paul asked the Christian congregation at Colossae why they continued subjecting themselves to the man-made decrees: “Do not handle, nor taste, nor touch.” (Col. 2:20-22)
Although it is true that Paul himself fasted on occasion while praying, Jehovah expects his servants to serve him cheerfully and enjoy food.
(Eccl. 3:12,13; Acts 13:1-3; Acts 14:23; 1 Tim 1:11)
Furthermore, fasting itself does not help us combat other carnal desires.
And the Bible makes it clear that we cannot make up for our shortcomings through fasting. (Is. 58:3-7)
Whether a Christian chooses to fast or not is an entirely personal, private matter. (Matt. 6:16-18)