It is common for diets these days to include cheat days. A day when you can pig out and eat whatever you like in as much quantity as you like. The reason they include these is for balance. Because it’s easier to eat Kale when you know eventually you’ll be allowed to finish a tub of ice cream in one go and you enjoy eating pizza for breakfast more when you know it’s a rare occurrence.
Balance is the key.
Too much routine and you lose adaptability. Too much spontaneity and you lose productivity.
Balance
Thomas Duggan 