Negative Calorie Foods

There has been some controversy as to the legitimacy of what are known as "negative calorie" foods, however I am a pretty big believer and supporter. Foods that are deemed "negative" perhaps are a little deceiving, as all food contains calories (with the exemption of fake sugar and, well, cardboard - but i guess neither of those count, right?), but the effect that eating this food has is best understood when given the title "negative". Believe it or not, there are certain foods you can eat that have the effect of not eating anything. Your body exerts effort when you chew, swallow, even digest your food, so it's not surprising that you don't retain every single stray calorie you ingest. On the contrary, your body burns off a percentage of the calories taken in at any given time, some foods requiring more effort than others. There are groups of food, primarily fruit and vegetables, that require so much effort for your body to digest, that you end up with a negative calorie effect when it boils down to pure numbers. You may have heard that chewing celery burns more calories than you gain from eating it - this is true. However, celery is not the only food that gives you this sweet grace, it's simply one of several (potentially more than twenty).
Many people have attempted to follow this list in a strict manner, cutting off all other foods in order to loose weight. This is not a smart idea, as these foods do not contain enough nutrients on their own to sustain your health for an extensive period of time. The controversy herein lies.

"Negative Calorie" Foods :
Asparagus
Beet Root
Broccoli
Cabbage
Carrot
Cauliflower
Celery
Cucumber
Garlic
Green Beans
Lettuce
Onion
Radish
Spinach
Turnip
Zuchini

Apple
Blueberry
Cantaloupe
Cranberry
Grapefruit
Honeydew
Lemon
Lime
Mango
Orange
Papaya
Peach
Pineapple
Raspberry
Strawberry
Tomato
Tangerine
Turnip
Watermellon