If there are only trace calories in each tiny serving of something, a company is allowed to say their product has zero calories. The problem? There are a whopping 350 - 600 plus servings in one can of cooking spray (depending on the size and brand)! And each of those "servings" translates into a frighteningly quick 1/3 of a second spritz. Who on Earth uses so little spray (or even has good enough reflexes to spray that quickly)? The truth is that there are about 7 calories per each 1 second spray (Pam even states this on their website ). I estimate that the typical spray-time required to thoroughly lightly coat a pan is around 2 seconds. That still adds up to less than 15 calories (much, much less than what you'd be taking in if you used regular cooking oil). The problem, though, is that people think nonstick cooking spray is absolutely calorie free and practically drench their pans, skillets and foil with the stuff. Try not to fall into that trap. Stick with the spray, but use it sparingly. Pssst...the same goes for "I Can't Believe it's Not Butter" spray.