Great post over at Lifehacker about the relative effectiveness of diet vs. exercise for weight loss. If you are a person who has ever uttered the phrase “I can eat whatever I want as long as I exercise” then this is definitely required reading. In short: you won’t lose weight without a calorie deficit. Furthermore, while exercise burns calories it doesn’t burn nearly as many as you probably think. The article actually references a study where participants showed a tendency to simultaneously over-report calorie burn from exercise and under-estimate calorie intake from food. As a nutrition logging obsessive for three years and running, this is something I’ve had some gritty in-the-trenches experience with.