"0 calorie foods"

It has come to my attention that the FDA allows anything with less than 5 calories per serving to be labeled as calorie free, or zero calories. Not a big deal for most things. For example, walden farms zero calorie dressings have actually 3-4 calories a serving, although it says "0" on the nutrition label. So in fact, the entire bottle actually contains 32 odd calories. Not a huge deal. Most things would not add up too high, like say, coffee which rather than "0" actually has about 2 per serving. Still, not a big deal.... Even 10 cups wouldn't break the calorie bank. Here's my point though... It's still something to be mindful of, because nothing except water truly contains zero calories. My mother, a perpetual dieter, has tried every diet out there and succeeded at none. Anyways, I digress.... I was watching her very liberally apply "I can't believe it's not butter" spray to her diet popcorn-a nightly occurance for her. To the tune of, say, 40 sprays or more. Well 5 sprays contains "0" calories but the entire bottle in fact contains over 900 calories and 99 grams of fat. She goes through those bottles left and right, counting each usage as "nothing". She was shocked when I told her this. Sneaky FDA! Just thought I'd share, I thought it's a good tip for newbies.