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Like most people, I love to eat. I've never been a fan of "dieting" and think most diets are doomed to failure. But in this weight-conscious, overfed, and under-exercised culture of ours, I know that many people are always on the lookout for quick and easy ways to lose weight.

For as long as I can remember, I've heard that certain foods, most notably celery, have "negative calories" – meaning that it takes more calories to eat the celery than the celery itself contains. So is it true that eating this crunchy vegetable is the secret to weight loss?
Chew Your Food
All foods contain calories, units of energy that our bodies "burn" through metabolic processes. The notion of negative-calorie (NC) foods depends on the idea that chewing and digesting these foods burns more calories than the food contains. Granted, it does take a bit of effort to chew celery, but you actually burn more calories by taking a shower than you do by chewing a celery stalk. In the case of celery then, let's turn our attention to digestion.
Readers, Digest This
An average stick of celery contains about 6 calories and is loaded with cellulose, a vegetable fiber that humans cannot digest. NC foodies claim that it takes more than 6 calories for humans to digest this fiber, thereby creating a calorie deficit. According to a test done at the Mayo Clinic, however, the amount of energy that the human body uses to digest celery does not exceed the number of calories that celery contains. According to the study, the digestion of celery burns only 0.5 calories.
Celery isn't the only "negative calorie food", but most of the other ones I've read about are also fruits and vegetables (regardless of actual calorie content). But if the NC food claim was true, vegetarian humans and herbivore animals (such as rabbits) would die of starvation because the mere act of eating (and digesting) would expend calories that were never replaced.
People who experience weight loss by eating celery (or any of the other fruits or vegetables on the many NC lists) probably lose weight because the celery is replacing other, high-calorie foods. Eating fruits and vegetables will help you lose weight. These foods are very filling. Plus, because of their low calorie content, dieters can eat fruits and veggies in larger quantities than high-calorie foods.
So if you're looking to lose weight, eating celery (or ANY fruit or vegetable) will definitely get you on the right track. But like all the other too-good-to-be-true diet claims out there, don't expect celery to be the magic bullet for easy weight loss!
Resources:
http://www.answerfitness.com/269/negative-calorie-foods-fact-fiction/
http://wiki.answers.com/Q/Is_it_true_that_celery_has_negative_calories
http://www.snopes.com/food/ingredient/celery.asp
http://smallbitesnutrition.blogspot.com/2009/01/you-ask-i-answer-celery-negative.html
http://recipes.howstuffworks.com/question670.htm
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