Mom's dieting rules:
If you crumble pieces off of a whole, then all the calories run out. This rule applies to all crumby foods, including cakes, cookys etc. If you take a whole piece of it on your plate, then no calories will run out.
That rule, however, does not apply to ice cream. If you eat ice cream out of the serving dish, It can have up to three times the calorie content!
Also, If no one sees you eating it, then it is safe to eat. This is based on the infallible rule that if you cover you eyes, no one can see you, which is a scientific fact.
If you follow these rules, I will not guarantee that you will not become fat, but I can guarantee that you will always have an excuse.