New research suggests the body may limit how many calories you burn in a workout—helping explain why weight loss is often ...

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. One of the benefits of ...

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 ...

This article was reviewed by Craig Primack, MD, FACP, FAAP, FOMA. You’ve heard the saying “calories in versus calories out” when it comes to weight loss. This is referring to a calorie deficit. But ...

Back in 2012, an evolutionary anthropologist named Herman Pontzer published some baffling data from his time among the Hadza, a group of hunter-gatherers in Tanzania. Using a sophisticated technique ...

If you're going to dedicate 30 minutes to a cardio workout, you likely want to get the biggest bang for your buck. And that often means tracking how many calories you burn during a session. It's ...

Dylan Thompson receives funding from BBSRC, NIHR, and Heart Research UK. He has previously had funding from MRC, BHF, and Unilever. He is a Fellow of The Physiological Society and the British ...

A calorie deficit is necessary to lose weight, which you can achieve by eating less or exercising more. The Mifflin St. Jeor equation estimates how many calories your body needs to function at rest.