Calorie counting what's the point?

Today I'm going to share with you an article from Harvard University Gazette, it talks about a study that compares a low calorie-low fat diet to a higher calorie-low carb diet. 

I want to stress this don't misinterpret what I'm saying and think that I'm telling you to cut out all your carbs.  The big message that you should take away is that a calorie is not a calorie.  Your body has a different response to different types of food.  Investing time and effort into counting calories instead of getting the right food is a serious weight loss mistake.

Check out the article at this link, very interesting stuff.
http://www.news.harvard.edu/gazette/2003/10.23/03-lowcarb.html