The idea behind negative calorie foods is that they require more calories to digest than they contain, so the more you eat the more calories you actually burn. Many nutritionists disagree with the theory, and will say that negative calorie foods no not actually exist.
Still, there is a lot of interest in the subject, and people want to know which foods contain negative calories and which do not.
So what about raspberries? Are raspberries a negative calorie food?
Yes, they are! Well, at least certain people will say so.
People who support the theory of negative calorie foods claim that many berries, including raspberries, contain negative calories. Despite this, there have been no actual scientific studies done on the subject.