What is a negative calorie foods, anyway? Is it just another diet gimmick, or can they really help you lose weight and keep it off? First of all, there is no such thing as a “negative calorie” – all foods have calories.
When people talk about negative calorie foods they are referring to foods that require more energy expended to digest them than you ingest when eating them. Example: water. Water isn’t technically a food, but it has zero calories. When you drink water, your body has to expend energy to absorb and process the water, so you now have a “negative calorie” effect, where you have burned more calories than you ingested.
The same concept can apply to foods that do have calories, especially if the calories are low in quantity. Remember too that even as your body is digesting food and absorbing liquid, it is also expending energy to keep vital bodily functions going, like respiration, heartbeat, blood circulation, and the like.




