It takes roughly 3 days of deficit eating in order to get our body to start burning stored fat for energy. So basically come Thursday you're finally tapping into fat stores. Then Friday morning Mike brings in donuts, Saturday night take out and drinks and then throw in a Sunday Brunch. Get off the hamster wheel of yoyo dieting. If you're not willing to stick to your plan over the weekends then you just don't want it bad enough.