The theory behind zero or negative calorie foods is that the energy you expend eating them cancels out their calories.
In essence they say that you don’t take in any calories, and in some cases you end up burning even more calories. Is this an accurate statement? Let’s find out!
Essentially calorie free
When trying to lose weight it can be next to impossible to find adequate snacks. To cope with the cravings and issue at hand, folks tend to seek out miracle foods that are purported to be negative in calories. These so called magic foods contain more water than calories and supposedly require more calories to utilize. Thus, making them essentially calorie free.
Magazines, oh my
Mainstream nutritional “magazine” science tells us that foods that are claimed to be negative in calories are mostly low-calorie fruits and vegetables such as celery, grapefruit, lemon, lime, apple, lettuce, broccoli, and cabbage. Up until now, there is no scientific evidence or study to show that any of these foods have a negative calorific impact. (University of California Press. pp. 189–190. ISBN 978-0-520-26288-1)
30 pounds of celery
Celery for example has a thermic effect of 8%, and as such much less than the 100% required for a “negative calorie” food. A stalk of celery provides 6 calories but our body expends only half of a single calorie digesting it.
Even the almighty and sacred proteins, which are the most complex to break down, have a thermic energy of only 20%–30%. You need 100% to be negative!
Therefore diets and programs based on negative-calorie food do not work as advertised. The do satisfy hunger by filling the stomach with food that are not calorically dense…We give them credit for that. But in no way are these miracle foods. Eat 30 pounds of celery and you will exceed your daily caloric intake. You probably also need to go visit the local clinic after such an experiment.