Ruth - I do. I tend to buy things pre-packaged. EG mini-weiss bars instead of a tub of ice-cream. It's easy to just take the tub and eat it all, but annoying to keep walking to the freezer.

And drinking a glass of water each time I want to snack is good too - eg pour a glass of water, and then eat the chocolate. Of course, the chocolate is a snack-size! And if I want another chocolate, I have to drink another glass of water.