No Snacks, no sweets, no seconds. Except on Days that start with S. Too simple for you? Simple is why it works. Look here for questions, introductions, support, success stories.
It means following No-S as written with no modifications.
"That which we persist in doing becomes easier for us to do. Not that the nature of the thing itself has changed but our power to do it is increased." -- Ralph Waldo Emerson
"You are what you eat -- so don't be Fast, Easy, Cheap or Fake."