I love my two S-days; during the week, knowing that the weekend surely is coming...gives me a sense of security in my diethead state of mind. To have this *free weekend* in the back of my mind is extremely helpful to me. One S-day wouldn't suffice, safety-valve (Reinhard's words) not enough of an impact.
In the beginning I put too much pressure on myself when planning S-days, 1-2 snacks and what and when...that made me feel deprived and I started to overdo it. I let completely loose now with a little planning, though. So now, through the habits I've formed during the weeks...my weekend meals have mostly and automatically become like the weekday meals with a few treats thrown in.
Another pro two S-day point: On Saturdays I have this voice i.t. back of my mind, saying: "No reason to go wild on sweets...tomorrow's another free day." And I can sense myself relaxing. And by Sunday night I've had enough, anyway.
The only three things I watch out for are:
a) Usually and out of habit I start with the sweets later in the day, knowing and expecting I'll have something scrumptious that afternoon. It's easy to wait.
b) I don't have a huge amount of sweets at one time. That would wake up the cookie monster and make me ravenous. But that's MY metabolism.
c) I loosely pre-portion, e.g., 1 bowl salad, 1 mini bowl chips, 1/2 glass milk, as situation calls for or mood strikes.
My weekends aren't perfect (what is perfect?) but pretty sane, I might say. Yesterday, i.e., brunch, afternoon coffee time with 1 piece of chocolate cake and Latte Macchiato, 1 medium glass Sprite, small dinner and later 2 bowls of salty snacks. If I had wanted I would've eaten more yesterday. Starting this morning, then, I say to myself: "The weekend is surely coming. It is *mine.* I can wait. There is a time for everything, and TODAY is the time for establishing my habit. Yes!"
I, almost subconsciously, try to walk the fine line between chaos and too much self-discipline...my *willpower muggies* ever growing

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Love and peace
H.