This article from CharlesPoliquin.com is a great read for anyone who believes they MUST count calories to lose weight! Depending on the source, calories are processed differently in the body. Some foods speed up metabolism, while others spike insulin levels. Make sure you are taking the time to cook and plan your weekly meals in advance so you do not have to grab processed snacks on the road. There has been more than one occasion that I have had to pull out a chicken breast while out and about. Believe me, taking that little bit of extra effort goes a long way.