There's a right—and wrong—way to follow one.

Interpreting a food label is a key skill to have.

Keith Ayoob answers the question: 'What is Metabolism, Can I Change It?' February 1, 2009 -- Question: What is metabolism, and is it possible to change my metabolic rate? Answer: Your metabolism is ...

Eating fewer calories during the week to save calories for the weekend—also known as calorie banking—can add flexibility, but ...

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 ...

Experts say the time at which you eat is, on its own, not as significant as some people believe it is. (Getty Creative) Does when you eat really matter? Maybe not. According to new research from Johns ...

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 ...

You’ve heard the saying “calories in versus calories out” when it comes to weight loss. This is referring to a calorie deficit. But what is a calorie deficit, exactly? Basically, you need to take in ...

If you’ve ever tried to lose weight, you’ve probably heard about the importance of “calories in versus calories out.” This concept is based on the idea that as long as you eat fewer calories than you ...

Long held up as the big benchmark of nutrition, the calorie is losing its clout in the age of GLP-1s and a sharper focus on nutrients.

Most of us know the feeling of lacing up our running shoes, dragging ourselves to the gym or diving into a pool of water and wondering how much bang we're really getting for our buck. Whether aiming ...