In order to accurately measure Spector’s metabolism ... The greater the metabolic rate — the ‘burning of calories’ — the more oxygen is consumed and the more CO2 is released.” ...

Kritika Sharma (26), a navigating officer in Merchant Navy, laughs on phone as she narrates how she went from being a girl who loved gorging on chocolates to now measuring calories in everything ...

A calorie is a measure of energy. It's an amount of heat that you can measure and um, you can burn food in a machine that tells you how much heat it creates. It works exactly the same way in the body.

Narrator: The formula for losing weight may look simple. Burn more calories than you consume. But actually measuring calories isn't, at least on your typical exercise machine. Mikael Mattsson ...

Macy Meyer is a North Carolina native who graduated from UNC-Chapel Hill with a BA in English and a second BA in Journalism. Macy is a Writer on the CNET How-To team, covering a variety of topics ...