[jshevek]

Not everyone changes their diet exclusively to lose weight. Some people would rather prevent medical issues, and or increase their well-being. This fixation on the calories in - calories out ignores all of this and is detrimental to people's health.

Further, many people would rather not have to track their calories everyday for the rest of their lives in order to maintain a healthy diet. They'd rather condition their body to prefer healthy foods, and to prefer healthy quantities of healthy foods. To do that you have to look at the source of the calories, not just the amount of calories.