Foods provide calories for energy, but digesting them also burns calories through the thermic effect of food (TEF). The question is: can any food require more energy to process than it supplies, creating 'negative calories'?
Celery is frequently cited as a prime example. While TEF does demand some energy, it's typically just 5-10% of the food's calories—never enough to exceed intake. Reliable nutrition science confirms negative calories don't exist.
Save your celery for a healthy snack, not a weight-loss miracle.
