![]() They estimated the value at about 699 calories. ![]() In one of the tests, subjects were asked to guess the calorie content of a bowl of chili. A 2010 study from Northwestern University’s Kellogg School of Management tested people’s perception of calories of meals both with and without a healthy side. The other application of negative calorie foods, tacking them onto otherwise unhealthy meals, isn’t much better. You may also start to lose muscle mass, since that will be broken down for fuel as well. When your body enters starvation mood, your metabolism will slow down and actually start fighting to keep you alive by storing fat for energy. These low-calorie, starvation diets can not be sustained for long periods of time and can even backfire. Diets that consist mainly of these foods are severely deficient in both total calories and vital nutrients. But this loss will be rapid and unhealthy. The first approach, loading your diet with almost exclusively negative calorie foods will absolutely make you lose weight. ![]() When people read that grapefruit is a negative calorie food that will burn calories for you, they react in one of two ways: Either they eat nothing but these negative calories foods, or they add it to their regular diets to try to counteract the calories from other foods. The real problem with this diet philosophy comes in the application. In practice, however, there is no scientific evidence to support the idea that a single food requires more calories to break down than it provides. So, in theory at least, negative calorie foods exist. The low-calorie options that populate the negative calorie food lists found all over the Internet do, in fact require energy to digest. According to the Mayo Clinic, about five to 10 percent of your daily caloric expenditure goes toward chewing, breaking down and storing your food.
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