Note that the secular left chooses Monday, a day when abstinence from meat was never enjoined in Christian tradition, rather than Friday or Wednesday (we Orthodox lay off meat on both — Wednesday in commemoration of Our Lord’s unjust arrest, Friday in commemoration of His Saving Crucifixion — leaving aside some celebratory feasting periods and the week after the Sunday when the Gospel reading is that of the Pharisee and the Publican, when *not* fasting is a matter of ascetic practice).
Every Monday a Clean Monday? No way!
Some Catholics in the area in and around New Orleans go meatless on Mondays. Years ago, I was down there visiting my dad and one of his friend’s wives, who is Catholic, said that the reason they eat beans & rice on Mondays is to atone for excess on the weekend.
Ar any rate, many people down there do have at least one or two meatless meals on Mondays.