Can't Help Myself with That Cake

I know I'm not supposed to eat this much sugar, especially when I want to stay fit and healthy. But every time I go to the bakery down the street, my hands start shaking and my stomach growls just thinking about that chocolate cake they have at the counter. It's got a thick layer of frosting and sprinkles on top, and it smells so good... Last weekend, when we had our book club meeting there, I brought home an extra slice to hide in the freezer for later. But now every time I pass by my freezer door, I feel guilty and wonder if I should just throw it away. So here's what I'm asking you all: how do you stop yourself from giving into these cravings? Any tips on fighting those temptations would be greatly appreciated.