Yeah. Some folks fast from social media, others from televisions, and some others from food. I need to fast from tech. If one is underweight, or small framed, fasting from tech would make more sense compared to fasting from food, as one must protect our bodies, as our bodies are Temples of the Holy Spirit (1 Corinthians 6:19-20).
Jesus talks about fasting, along with Joel.
Matthew 6:16-18 (NIV): "When you fast, do not look somber as the hypocrites do, for they disfigure their faces to show others they are fasting. Truly I tell you, they have received their reward in full. But when you fast, put oil on your head and wash your face, so that it will not be obvious to others that you are fasting, but only to your Father, who is unseen; and your Father, who sees what is done in secret, will reward you."
Joel 2:12 (NIV): "'Even now,' declares the Lord, 'return to me with all your heart, with fasting and weeping and mourning.'"