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 ...

Keith Ayoob answers the question: 'What are Calories, Why Do They Matter?' February 1, 2009 -- Question: What is a calorie and why is it important to know how many calories there are in certain foods?

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.

The Fitbit calorie tracker feature can be useful when planning a diet or workout schedule. Here's how Fitbit calculates ...

Knowing the calorie content of foods does not help people understand which foods are healthier, according to a study I recently co-authored in the Journal of Retailing. When study participants ...

Keeping track of what you eat can help you make better choices, because you know that whatever you choose, you’ll have to write it down. But that doesn’t mean you need to obsess over every calorie or ...

In TODAY.com's Expert Tip of the Day, a doctor shows you how to quickly spot foods that have been linked to poor health ...

A calorie is simply a unit of heat energy. It's defined as the amount of heat needed to raise the temperature of 1 gram of water 1 degree C. In terms of nutrition, a calorie is a measure of how much ...

Most people wouldn’t be able to fathom eating 10,000 calories in a single sitting, let alone stay in shape while doing so. But Katina DeJarnett has made a career out of eating five pounds of food at a ...

Corrections & clarifications: An earlier version of this story misspelled the name of the spokesperson for the Academy of Nutrition and Dietetics. She is Caroline Susie. Few things are as essential as ...