Everything we consume contains energy our bodies use to move, grow and maintain health. To work out how much energy is in different foods and drinks, we need to first look at a few core concepts.

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 ...

Newswise — 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 ...

This Halloween, when you grab a candy bar, pay attention to the wrapper. In the United States, a "nutrition facts" label has been required for all packaged foods since 1994, giving the serving size ...

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. First off, the number that they write on the ...