One thing you can count on with the Catholics, they write everything down. It's just a matter of knowing where to look.
If it's not in God's Word, I don't believe it, please give me Scripture.
Well, if by some strange circumstance you were to find yourself in a Catholic church anywhere in the world during Lent this would be in the first reading:
Yet even now, says the LORD, return to me with your whole heart, with fasting, and weeping, and mourning;
Rend your hearts, not your garments, and return to the LORD, your God. For gracious and merciful is he, slow to anger, rich in kindness, and relenting in punishment.
Perhaps he will again relent and leave behind him a blessing, Offerings and libations for the LORD, your God.
But, of course what you object to is not the fasting itself, which the Master told his disciples to do. There are more than a few Bible only Christians that engage in fasting much more intensely than Catholics do. I'll guess that you object to the Church's authority to determine the details for her members. That's understandable but it is a different subject.
And then there is Sean "I forgot it was Friday" Hannity. Okay, Sean. If you really forgot then you know it's no big deal, hardly worth mentioning.