I think it's the psychology of the point system that works. No more thinking solely in terms of calories, fat or carbs; it's just about the POINTS...that secret formula that Weight Watchers tell us is based on the Glycemic Index. Stay within the allotted points and you lose weight!
I equate it to having $100.00 n your pocket and walking into a store...you decide: Do I want this designer $100.00 item or these four knockoffs? Some days you want the designer item...but on other days it feels good to get a bargain and a larger bag!
Every day I make eating choices that make me happy and satisfy my needs for the day. Sometimes my daughter and I splurge on a lunch at our favorite Chinese restaurant. I make the best choices I can while there, skip the cream cheese wontons, choose the plain rice over the fried rice, and often take part of the food home for later. But whatever points I "spend" during that lunch fits into my daily plan...which may mean that I'll eat a lighter dinner (my Crockpot Broccoli Soup, Progresso soup or some vegetable based dish for example.) The daily total is what counts.
My daughter eats larger meals, and hits the sack early each night. I usually eat light early in the day with a reasonable dinner, and save points for snacking in the evening since I am a night owl.
I love the Weight Watchers system because it works for me. I've learned to look for bargains, how to spend my points wisely as well as budget them throughout the day and week. But I think the Weight Watcher's program works for me mostly because of all the choices I have...tomorrow is always a new day!