Earn It

There are times when you may not be able to resist that chocolate/cookie/ice cream/etc... and eating such things is fine in moderation, however it may affect your daily calorie goals.

I suggest that if you must snack on something unhealthy with little nutrients, earn it first. For example, if you really want to eat a tub of ice cream that's worth around 1000 calories, first consider a lower calorie option such as frozen yogurt, and then if you still can't resist, burn off 1000 calories with cardio FIRST and then go for it. Not only will you know that you can eat the ice cream without feeling guilty, but the amount of hard work you had to do to earn that ice cream may make you think again the next time you have an unhealthy food craving.