"These are matters which have, to be sure, the appearance of wisdom in self-made religion and self-abasement and severe treatment of the body, but are of no value against fleshly indulgences." Col. 2:23
You must really like beef (or really hate fish)! You really think this is "severe treatment of the body"?
Certainly you don't think prayer and fasting are extra-scriptural, do you? Or is it sinfull because Catholics choose to do it together?