A calorie is a unit of heat energy that fuels your body, making it possible to move, breathe, think, sleep—and even digest food to make more energy. While there is some disagreement about who first ...

What is a calorie? While most people think of calories in relation to food, calories are simply a unit of heat energy. In fact, measuring calories is essential to energy science because every chemical ...

Did you know that a calorie label only has to be accurate within twenty percent? It’s a wide margin, but it exists for a reason: calories are complicated. Did you know that a calorie label only has to ...