After Christian hegemony of the Roman Government. Fasting days increased as Byzantine increased. Meaning government Titled and Clerical offices. The Wage-workers were already fasting, meat was a rarity. Titled and Clerical offices received the benefits of office meat and wealth was a benefit. The Great Fast is a period when food was the scarcest in these times until modern agriculture. The increasing of the other fasts is highly conclusive.
11/28/2012 - 01/06/2013
03/18/2013 - 05/04/2013
07/01/2013 - 07/12/2013
08/14/2013 - 08/28/2013
Church Fasting 1st Century to 4th Century
All four fasts of the Church practice were done seven days before the feast day, and if feast day landed on a fast day, the fast day was not a Strict Fast, ie fish, wine, & oil were allowed.