How is it possible for something to have zero calories?

INDIANAPOLIS (WISH) Picture this. You’re at the grocery store perusing the aisles and come across a beverage you’ve never heard of, but would like to try depending on the number of calories it has, that is. With one eye shut, you slowly turn to the nutrition label on the back of the bottle only to find out your drink of choice has zero calories. Zero! But how it is possible for certain food/drink items to contain no calories at all? In this segment of Health Spotlight Life.Style.Live! I talk about why zero calories doesn’t always add up.