Little off-topic: Why reducing carb intake isn't considered a lifestyle change? Just asking why for example vegetarism is not a diet, but a lifestyle, where as Atkins is just a diet? If you would read at least one Atkins book, you'd find out that they put emphase on the fact that you have to change your lifestyle forever, or else you will just return back to former self.
Back to topic: Personally I don't believe that human body work like basic 1+1 math. What I mean is that there are several more factors to be considered to the equation. For fat storaging, body needs insulin. If you control factors that contribute to insulin production, you can control how much energy is storaged to your body (carbs = glucose = sugar = high blood sugar = need insulin to decrease the blood's sugar-levels = excess glugoce on blood storages as fat).
Other thing is hunger control. Bouncing blood sugar causes hunger spikes. So keeping your blood sugar level as stable as possible by eating low-carb (low blood sugar raising) or whole grained food controls your hunger. A very huge advantage to one who wishes to loose weight.
Oh and sugar addiction is reality! I include fast absorbed carbs to the defintion 'sugar'. I had withdrawl symptoms of sugar when I first stopped using it. I stopped drinking soda, eating white bread, rice, potatoes and basicly anyting that contained sugar or high ammount of carbs. I had headaches, insomnia and massive cravings for sweets. But after couple of weeks I got out of it and I never get that sort of cravings anymore.
When I was heavy, I tried all sorts of diets. And also portion controlling etc traditional ways. I found out that reducing carb is the way to go for me. My digestion works way better than before. But really, making the change is hard, no matter is it carb controlling or portion controlling. And the best thing is to find out what works best for you. Testing diets is not bad, I think, because one should really find out the most comfortable way for oneself to loose weight. For me, that was the only way of being able to change my whole lifestyle.
So basicly I nowadays eat like this: My plate is half on vegetables, half on meat/fish/protein/fat-source. If I eat snacks or something like that it's nuts (love those macademias!). If I fry on pan, I use butter. For meat cuts, I choose normal fat cuts, not too trimmed. I eat dairy products that doesn't have added sugar (milk, cheese, cream, yoghurt etc). And also choose the dairy products as normal fat%, never low-fats. I also eat berries (Finland is a berry country!

), but not fruits. I use olive oil without a worry as dressing etc. Berries, nuts and some vegetables give me plenty of fibers also.
But as former food addict, I must admit that every now and then I still eat a pizza, junk food, good food high in carbs and consume alcohol every now and then. I know these are bad, but I enjoy them so much that I wouldn't call it life without them

. It's all about living your life the way you are comfortable.