"Pickles are touted as a 'zero calorie' food since they are just cucumbers in salt water," says Whetzel. "But if you eat too many pickles
Splenda
Splenda is 600 times sweeter than table sugar, meaning you usually need just a little bit to achieve your desired sweetness
Sugar-Free Syrups
Zero-calorie" syrups are sweetened with sucralose (aka Splenda), which can add serious calories to your beverage when consumed in large amounts.
Flavored Coffee
That's not awful since you're likely only having one cup in total, but be mindful of any milk and sugar you're adding in, cautions Whetzel.
Celery
Celery is often said to be a "negative calorie food," meaning that it takes more energy to digest than the food provides. But there is no such thing as negative calories.