All foods must contain a certain amount of calories, so how can there be something called a negative calorie food? The term actually refers to foods which use up more calories during the process of digestion than they add to the body. So in this sense, you are losing calories every time you eat these foods.
What about pears? Are pears a negative calorie food?
I could not find any definitive answer in my research, but many sources claim that pears are indeed negative calorie foods. However, I can’t find any specific numbers or research to back up this claim, and many nutritionists actually believe that there really is no such thing as a true negative calorie food.