We hate to be the bearer of bad news, but there's no merit to the claim that celery is a negative-calorie food. And it's not just celery—negative-calorie foods don't exist. As this video from SciShow explains, the idea behind the celery myth makes some sense: Chewing, swallowing, and digesting takes energy and burns calories. But even low-calorie celery (a stalk is about 8 calories) takes only 2 calories to digest. That doesn't mean you shouldn't be eating lots of veggies, but chowing down on celery stalks alone won't lead to weight loss.