It's your party and you can eat if you want to, but if it's someone else's party and you're on a diet, overindulging may be a diet destroyer. You're biggest enemy: the cake. One mistake many make is asking for a sliver of a slice. If your willpower is weak (as many new dieters' resolve often is) a small slice may justify a second helping or the sliver syndrome — sampling various small pieces of different desserts. You are not effectively portioning. For the next birthday bash you host or attend, try making petite desserts for individual consumption, such as smaller cakes. Make a healthier cake by using neat tricks like swapping out sugar for apple sauce. Even choosing healthier cakes, like angel food cake, might be a better option for you to indulge in.