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?

Swimming is a low-impact workout that also targets multiple muscle groups. “In just 30 minutes of swimming, an average person ...

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 ...

Add Yahoo as a preferred source to see more of our stories on Google. Your weight loss journey is your own. It looks different for each person. If you have been on a weight loss journey, you know how ...

Add Yahoo as a preferred source to see more of our stories on Google. Experts say the time at which you eat is, on its own, not as significant as some people believe it is. (Getty Creative) (Elizaveta ...

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 ...

Can you build muscle while you are eating fewer calories to lose fat and excess weight? Learn what may help meet your goals.

When you’re on a weight loss journey, there’s a common misconception that a 1,200-calorie diet is the “correct” amount you need to shed those few extra pounds. But here’s the thing: This isn’t ...

What Is a Low-Calorie Diet? Benefits of a Low-Calorie Diet Calorie Restriction Getting Enough Calories Following A Low-Calorie Diet When it comes to dropping pounds, there’s no denying that calories ...

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 ...