This article was reviewed by Craig Primack, MD, FACP, FAAP, FOMA. There’s some truth to the saying ”calories in, calories out” when talking about weight management. However, not all calories are ...

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.

Food labels make calories seem simple. They show the number of calories per serving, which is calculated based on how much ...

Most people walk into a fast food restaurant thinking the burger or sandwich is the thing to watch. You size up the main, ...

Calories aren’t always obvious. A plate that looks huge might be surprisingly light, while a smaller serving can carry more energy than you’d expect. Put side by side, 1,000 calories of different ...

Energy density – the number of calories per gram; candy and dried fruit are calorie dense, celery not so much. The more calorie-dense food you eat per volume, the more calories you take in. Speed of ...

If you eat fast food regularly you’re probably aware of how quick and easy it is to consume a whole bunch of calories in a short amount of time. A single meal at your typical fast food burger joint ...

Most of the American diet is composed of calories from ultraprocessed foods, which have been linked to a myriad of poor health outcomes and are a key target in U.S. Health and Human Services Secretary ...

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 ...

Beth Skwarecki is Lifehacker’s Senior Health Editor, and holds certifications as a personal trainer and weightlifting coach. She has been writing about health for over 10 years. If you want to start ...

Fast food desserts are designed to be irresistible—rich, sweet, and indulgent. But many of these treats come with a steep nutritional price tag, especially in terms of calories. Whether you're ...