moderato. adv. 1. (Music, other) at a moderate tempo. 2. (Music, other) (preceded by a tempo marking) a direction indicating that the tempo specified is to be used with restraint: allegro moderato.
While celery is a very low-calorie food, it likely doesn't provide you with negative calories. Mayo Clinic suggests that while it's theoretically possible for negative-calorie foods to exist, there are no reputable scientific studies that prove certain foods cause negative calorie effects.
In fact, protein is the macronutrient that causes your body to burn the most calories, according to a review published in 2008 in the American Journal of Clinical Nutrition. Furthermore, while fiber isn't absorbed by your body, a medium-sized celery stalk only contains 0.6 grams of fiber but provides 6 total calories. Chances are your body will absorb at least some of the calories celery provides.