It depends on how you measure whether or not it works. In the short term, it is absolutely successful in causing weight loss. I've done it, I know others who

It depends on how you measure whether or not it works. In the short term, it is absolutely successful in causing weight loss. I've done it, I know others who have done it, there are people who make their livelihood helping others do it. On the other hand, the problem with calorie counting is that most people only do it for a very short time, because it sucks. It's totally unsustainable for most people because they don't have the time or aren't willing to change their lifestyle to include hours per day spent focusing on nutrition. So they lose some weight over the course of several months, then let their nutrition lapse and gain it all back in a few weeks. So in the long term you're right, across a population calorie counting doesn't work. But only because across a population people are lazy.