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1) TIME magazine: You may have heard that some foods, because they are difficult to digest, will make you lose weight. Dubbed "negative-calorie foods," citrus fruits and celery have both basked in this flattering light in fad diets over the years. The problem is that it's not true. The calories your body burns in fueling the digestive cycle are minuscule compared with the calories in the food itself. Although chewing celery might seem like a strenuous activity, it burns about the same amount of calories as watching grass grow.
2) WIKIPEDIA: A negative calorie food is a food that is purported to require more calories to be digested than it provides. That is, its thermic effect is greater than its calorie content (Thermic Effect: the increment in energy expenditure above resting metabolic rate due to the cost of processing food for storage and use. It is one of the components of metabolism along with the resting metabolic rate, and the exercise component). While this concept is popular in dieting guides, there is no scientific evidence that any of the foods claimed as negative calorie foods are such. Foods that are claimed to be negative in calories are mostly low-calorie fruits and vegetables such as grapefruit, lemon, lime, apple, lettuce, celery, broccoli and cabbage. Celery, a commonly cited negative calorie food, actually requires only about 10% of its calorie content to be digested (due to the thermic effect). Zero-calorie beverages, such as water, do take more than zero calories to process within the body, however they do not offer the dietary sustenance that other so-called negative calorie foods do in the form of fiber, carbohydrates, vitamins etc and as such, are not generally regarded as being negative calorie.
3) LISTVERSE: But the problem is, the numbers don’t add up. One stick of celery contains around six calories2. A female weighing 150 pounds, aged 35, and 65 inches tall, burns 30 calories per hour3 eating whilst sitting. In the interests of science I ate a stick of celery (which is no mean feat considering I hate raw celery) to see how long it would take: 2 minutes and 14 seconds. If the female described above takes as long as I do, that means she can eat just under 30 sticks of celery in one hour – totaling 180 calories. That leaves an excess of 150 calories still not burned. Granted, there is some calorie burning involved in the digestive process as well, but there is no way these numbers allow for negative calories; on average you burn 62 calories an hour just existing4 (this includes digestion) – that still leaves an excess calorie count of 88. No matter which way you look at it – celery does not result in negative calories.
4) EXCELLE: No food has negative calories. The theory of negative calories is that you expend more calories chewing very low-calorie foods, like celery, than the food actually has. Gans cautions, “‘Negative’ calories is a myth and does not actually exist.” However, celery can aid in weight loss. One large stalk, for instance, provides only 10 calories. Additionally, it provides fiber and has a very high water content (95% of total weight). That can boost a feeling of fullness, which can then play a role in weight loss. But the actual activity of chewing most foods may burn only about five calories in an hour. Any way you slice it, though, the positive news is that munching celery or any other raw veggie can help you get to, and keep, a healthy weight.
5) THATS FIT: Experts do know that you burn between 5 and 10 percent of the calories you eat each day simply digesting food. This is called the thermic effect of food and it's one part of how your overall metabolism works. "It's very difficult to measure the energy expenditure for individual foods," Lanou says. However, she says, they can make an educated guess. For example, one stock of celery has about six calories. If you munch on three stocks of celery, you've consumed 18 calories. Digesting that celery is likely to cost more than 18 calories -- perhaps 25 -- potentially leaving you with a seven-calorie loss. While it's true that every calorie adds up, it's not going to have much of an effect overall. In fact, you'd probably burn more calories going for a walk around the block after a meal. Another thing to consider is that eating three stalks doesn't provide much sustenance. The generally agreed-upon list of negative calorie foods are mostly fruits and vegetables and eating these foods by themselves won't fill your caloric needs for the day. You need protein and carbohydrates too. If you try to rely on celery alone, the eventual hunger will make you more likely to reach for something unhealthy that contains a lot more than your "free" seven calories. There is also growing evidence that certain compounds have a thermogenic effect on your metabolism-meaning they help you burn more calories without even trying. Hot peppers and ginger contain capsaicin, which raises your body temperature and energy expenditure. The only caveat is that the amount of hot peppers you'd need to eat to make a real difference would leave your mouth on fire for days. But if you like spicy foods, it can't hurt to try. Coffee and green tea can also be thermogenic because they contain caffeine. There has been special interest in green tea, since it has both caffeine and catechins, thought to help you break down fat more effectively. One study showed that drinking three or more cups of green tea daily raised metabolism by 3.5 percent over 24 hours. However, caffeine isn't well tolerated by everyone: It can make some people jittery or anxious, and people with any kind ofheart condition are generally advised to avoid caffeine.
6) In a forum: The body might expend more energy metabolizing celery than is contained in the celery, but even if that were true, the calorie deficit would be negligible.
People who experience weight loss eating celery (or grapefruit, another food thought to contain "negative calories"), probably lose the weight because the celery is displacing some other high-calorie foods, such as chips or nuts or candy, in their diets. This contributes to a calorie reduction and a daily calorie deficit that induces the body to burn stored adipose (fat) tissue.
A STICK OF CELERY CONTAINS 6 CALORIES. IT ALSO TAKES THE BODY 6 CALORIES TO ACTUALLY EAT AND DIGEST IT.
People who experience weight loss eating celery (or grapefruit, another food thought to contain "negative calories"), probably lose the weight because the celery is displacing some other high-calorie foods, such as chips or nuts or candy, in their diets. This contributes to a calorie reduction and a daily calorie deficit that induces the body to burn stored adipose (fat) tissue.
A STICK OF CELERY CONTAINS 6 CALORIES. IT ALSO TAKES THE BODY 6 CALORIES TO ACTUALLY EAT AND DIGEST IT.
OOOh this helps. thankyou girl.
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