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?

The number of calories you need to eat to lose weight depends on several factors, including your sex, age, physical activity levels, genes, and medical history. No matter what, you need to be in a ...

To lose weight, you need to be in a calorie deficit. However, it's not as simple as consuming fewer calories. Depending on your physical activity, age, calories burned and more factors, a calorie ...

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 ...

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 ...