I often get carb cravings in the afternoon. Sometimes I'll walk outside and think about buying a bag of Pepperdige Farm cookies. Often I come back empty handed, dissuaded partly by the thought of wasting money on junk food, but mainly by the knowledge that I almost always consume the entire bag in half an hour, and spend the rest of the afternoon with sugar overdose symptoms.
After reading this story, I went outside and bought a bag of Pepperidge Farm cookies and left them on my desk.
A month later, they are still on my desk, unopened. It was a weirdly effective commitment strategy. I don't have to walk past the shop, thinking about buying cookies, because I already have cookies. And I don't eat the cookies, because I want to be stronger than the "Irresistible" marketing on the package.