That "butter flavored cooking spray" is not completely calorie-free. It is labled 0 calories for the defined serving size. The regulations allow a company to do that if the serving is less than 5 calories. So, depending on the type of spray you're using, each "serving" might be 4 calories, and that adds up; after all, I'm sure the first ingredient listed is some sort of oil or other fat. That doesn't mean you can't use it, but just read the label and understand what you're using and how much.
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