The researchers assumed that people use about 25% of their meal energy for digestion and absorption of food, (a percentage that's two to three times higher than what has been calculated in most human studies and also likely accounts for the calories burned from chewing.)Įven with very conservative estimates, the researchers calculated that people would retain about 19 to 50% of the calories from these foods. In addition to celery, these foods included broccoli, apples, carrots, grapefruit, tomato, cucumber, watermelon, green leaf lettuce and blueberries. That meant that the animals retained about 24% of the meal's energy.Īlthough the study looked at only one food in one type of animal, the researchers then made a few assumptions in order to estimate the net energy gain (or loss) that might occur in people if they consumed 10 foods that are often cited as negative calorie. The animals used about 33% of the calories in the meal for digestion, and about 43% were excreted. They also accounted for how much energy was lost in the animals' urine and feces. The study, led by then-undergraduate student Katherine Buddemeyer, used special machines to determine the animals' metabolic rate, as well as how much energy they used to digest and absorb meals of raw, diced celery. Plus, they don't mind eating a lot of celery. Although bearded dragons and people aren't exactly close on the evolutionary tree, they have some things in common: They are omnivores, and have a gastrointestinal tract and digestive process that's similar to that of mammals, including humans, the researchers said. In the new study, the researchers used the "bearded dragon" lizard ( Pogona vitticeps) for their animal model. But few studies have put the idea to the test. For example, the Academy of Nutrition and Dietetics says that foods such as celery, lettuce and cucumbers still count toward your day's calories, despite containing very few calories. Many nutritionists and doctors have been skeptical of the idea of negative calories. The study has been submitted to the Journal of Experimental Biology and is under review, Secor said. ![]() Instead, the researchers suggest referring to these foods as "negative budget" foods, since consuming them "will favor a daily negative budget, and hence weight loss," they wrote in their paper l. What's more, a meal of celery is "not going to sustain you for very long," Secor said. ![]() (12.6 kg), according to the researchers' estimates - to offset the number of calories you burn in a day overall. ![]() You'd have to eat an awful lot of celery - nearly 30 lbs. That's because, being low in calories, they don't put much of a dent in your daily calorie needs. But even if these foods aren't technically "negative-calorie," eating them could still help you lose weight.
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