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?

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 ...